Hugo Grotius – Portrait by Michiel Jansz. van Mierevelt, 1631
|Born||10 April 1583|
|Died||28 August 1645 (aged 62)|
|Alma mater||Leiden University|
|Philosophy of war, International law, Political philosophy|
|Theory of natural rights, grounding just war principles in natural law|
Hugo Grotius (//; 10 April 1583 – 28 August 1645), also known as Huig de Groot (Dutch: [ˈɦœyɣ də ɣroːt]) or Hugo de Groot (Dutch: [ˈɦyɣoː də ɣroːt]), was a Dutch jurist. Along with the earlier works of Francisco de Vitoria and Alberico Gentili, Grotius laid the foundations for international law, based on natural law. A teenage intellectual prodigy, he was imprisoned for his involvement in the intra-Calvinist disputes of the Dutch Republic, but escaped hidden in a chest of books. He wrote most of his major works in exile in France.
It is thought that Hugo Grotius was not the first to formulate the international society doctrine, but he was one of the first to define expressly the idea of one society of states, governed not by force or warfare but by actual laws and mutual agreement to enforce those laws. As Hedley Bull declared in 1990: "The idea of international society which Grotius propounded was given concrete expression in the Peace of Westphalia, and Grotius may be considered the intellectual father of this first general peace settlement of modern times."
Additionally, his contributions to Arminian theology helped provide the seeds for later Arminian-based movements, such as Methodism and Pentecostalism, and he is acknowledged as a significant figure in the Arminianism–Calvinism debate. Because of his theological underpinning of free trade, he is also considered an "economic theologist".
- 1 Early life
- 2 De Indis and Mare Liberum
- 3 Arminian controversy, arrest and exile
- 4 On The Truth of the Christian Religion
- 5 De Jure Belli ac Pacis
- 6 Natural law
- 7 Later years
- 8 Personal life
- 9 Commentary on Grotius
- 10 Bibliography (selection)
- 11 See also
- 12 References
- 13 Further reading
- 14 External links
Born in Delft during the Dutch Revolt, Hugo was the first child of Jan de Groot and Alida van Overschie. His father was a man of learning, once having studied with the eminent Justus Lipsius at Leiden, as well as of political distinction, and he groomed his son from an early age in a traditional humanist and Aristotelian education. A prodigious learner, Hugo entered the University of Leiden when he was just eleven years old. There he studied with some of the most acclaimed intellectuals in northern Europe, including Franciscus Junius, Joseph Justus Scaliger, and Rudolph Snellius.
At age sixteen he published his first book: a scholarly edition of the late antique author Martianus Capella's work on the seven liberal arts, Martiani Minei Felicis Capellæ Carthaginiensis viri proconsularis Satyricon, in quo De nuptiis Philologiæ & Mercurij libri duo, & De septem artibus liberalibus libri singulares. Omnes, & emendati, & Notis, siue Februis Hug. Grotii illustrati [The Satyricon by Martianus Minneus Felix Capella, a man from Carthage, which includes the two books of 'On the Marriage of Philology and Mercury', and the book named 'On the Seven Liberal Arts'. Everything, including corrections, annotations as well as deletions and illustrations by Hug. Grotius].
In Holland, Grotius earned an appointment as advocate to The Hague in 1599 and then as official historiographer for the States of Holland in 1601. His first occasion to write systematically on issues of international justice came in 1604, when he became involved in the legal proceedings following the seizure by Dutch merchants of a Portuguese carrack and its cargo in the Singapore Strait. 
De Indis and Mare Liberum
The Dutch were at war with Spain and Portugal when the loaded merchant ship Santa Catarina, a Portuguese carrack, was captured by captain Jacob van Heemskerk off present-day Singapore in 1603. Heemskerk was employed with the United Amsterdam Company (part of the Dutch East India Company), and though he did not have authorization from the company or the government to initiate the use of force, many shareholders were eager to accept the riches that he brought back to them.
Not only was the legality of keeping the prize questionable under Dutch statute, but a faction of shareholders (mostly Mennonite) in the Company also objected to the forceful seizure on moral grounds, and of course, the Portuguese demanded the return of their cargo. The scandal led to a public judicial hearing and a wider campaign to sway public (and international) opinion. It was in this wider context that representatives of the Company called upon Grotius to draft a polemical defence of the seizure.
The result of Grotius' efforts in 1604/05 was a long, theory-laden treatise that he provisionally entitled De Indis (On the Indies). Grotius sought to ground his defense of the seizure in terms of the natural principles of justice. In this, he had cast a net much wider than the case at hand; his interest was in the source and ground of war's lawfulness in general. The treatise was never published in full during Grotius' lifetime, perhaps because the court ruling in favor of the Company preempted the need to garner public support.
In The Free Sea (Mare Liberum, published 1609) Grotius formulated the new principle that the sea was international territory and all nations were free to use it for seafaring trade. Grotius, by claiming 'free seas' (Freedom of the seas), provided suitable ideological justification for the Dutch breaking up of various trade monopolies through its formidable naval power (and then establishing its own monopoly). England, competing fiercely with the Dutch for domination of world trade, opposed this idea and claimed That the Dominion of the British Sea, or That Which Incompasseth the Isle of Great Britain, is, and Ever Hath Been, a Part or Appendant of the Empire of that Island.
Arminian controversy, arrest and exile
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Aided by his continued association with Van Oldenbarnevelt, Grotius made considerable advances in his political career, being retained as Oldenbarnevelt's resident advisor in 1605, Advocate General of the Fisc of Holland, Zeeland and Friesland in 1607, and then as Pensionary of Rotterdam (the equivalent of a mayoral office) in 1613. In 1608 he married Maria van Reigersbergen, with whom he would have eight children (four surviving beyond youth) and who would be invaluable in helping him and the family to weather the storm to come.
In these years a great theological controversy broke out between the chair of theology at Leiden Jacobus Arminius and his followers (who are called Arminians or Remonstrants) and the strongly Calvinist theologian, Franciscus Gomarus whose supporters are termed Gomarists or Counter-Remonstrants. Leiden University "was under the authority of the States of Holland – they were responsible, among other things, for the policy concerning appointments at this institution, which was governed in their name by a board of Curators – and, in the final instance, the States were responsible for dealing with any cases of heterodoxy among the professors." The domestic dissension resulting over Arminius' professorship was overshadowed by the continuing war with Spain, and the professor died in 1609 on the eve of the Twelve Years' Truce. The new peace would move the people's focus to the controversy and Arminius' followers.
Controversy within Dutch Protestantism
The controversy expanded when the Remonstrant theologian Conrad Vorstius was appointed to replace Jacobus Arminius as the theology chair at Leiden. Vorstius was soon seen by Counter-Remonstrants as moving beyond the teachings of Arminius into Socinianism and he was accused of teaching irreligion. Leading the call for Vorstius' removal was theology professor Sibrandus Lubbertus. On the other side Johannes Wtenbogaert (a Remonstrant leader) and Johan van Oldenbarnevelt, Grand Pensionary of Holland had strongly promoted the appointment of Vortius and began to defend their actions. Gomarus resigned his professorship at Leyden, in protest that Vorstius was not removed. The Counter-Remonstrants were also supported in their opposition by King James I of England "who thundered loudly against the Leyden nomination and gaudily depicted Vorstius as a horrid heretic. He ordered his books to be publicly burnt in London, Cambridge, and Oxford, and he exerted continual pressure through his ambassador in the Hague, Ralph Winwood, to get the appointment cancelled." James began to shift his confidence from Oldenbarnevelt towards Maurice.
Grotius joined the controversy by defending the civil authorities' power to appoint (independently of the wishes of religious authorities) whomever they wished to a university's faculty. He did this by writing Ordinum Pietas, "a pamphlet...directed against an opponent, the Calvinist Franeker professor Lubbertus; it was ordered by Grotius' masters the States of Holland, and thus written for the occasion – though Grotius may already have had plans for such a book."
The work is twenty-seven pages long, is "polemical and acrimonious" and only two-thirds of it speaks directly about ecclesiastical politics (mainly of synods and offices). The work met with a violent reaction from the Counter-Remonstrants, and "It might be said that all Grotius' next works until his arrest in 1618 form a vain attempt to repair the damage done by this book." Grotius would later write De Satisfactione aiming "at proving that the Arminians are far from being Socinians."
Decretum pro pace ecclesiarum (1613–14)
Led by Oldenbarnevelt, the States of Holland took an official position of religious toleration towards Remonstrants and Counter-Remonstrants. Grotius, (who acted during the controversy first as Attorney General of Holland, and later as a member of the Committee of Counsellors) was eventually asked to draft an edict to express the policy of toleration. This edict, Decretum pro pace ecclesiarum was completed in late 1613 or early 1614. The edict put into practice a view that Grotius had been developing in his writings on church and state (see Erastianism): that only the basic tenets necessary for undergirding civil order (e.g., the existence of God and His providence) ought to be enforced while differences on obscure theological doctrines should be left to private conscience.
The edict "imposing moderation and toleration on the ministry", was backed up by Grotius with "thirty-one pages of quotations, mainly dealing with the Five Remonstrant Articles." In response to Grotius' Ordinum Pietas, Professor Lubbertus published Responsio Ad Pietatem Hugonis Grotii in 1614. Later that year Grotius anonymously published Bona Fides Sibrandi Lubberti in response to Lubbertus.
Jacobus Trigland joined Lubberdus in expressing the view that tolerance in matters of doctrine was inadmissible, and in his 1615 works Den Recht-gematigden Christen: Ofte vande waere Moderatie and Advys Over een Concept van moderatie Trigland denounced Grotius' stance.
It is generally assumed that Grotius first propounded the principle of freedom of the seas, although all countries in the Indian Ocean and other Asian seas accepted the right of unobstructed navigation long before Grotius wrote his De Jure Praedae (On the Law of Spoils) in the year of 1604. Additionally, 16th century Spanish theologian Francisco de Vitoria had postulated the idea of freedom of the seas in a more rudimentary fashion under the principles of jus gentium. Grotius's notion of the freedom of the seas would persist until the mid-twentieth century, and it continues to be applied even to this day for much of the high seas, though the application of the concept and the scope of its reach is changing.
In late 1615, when Middelburg professor Antonius Walaeus published Het Ampt der Kerckendienaren (a response to Johannes Wtenbogaert's 1610 Tractaet van 't Ampt ende authoriteit eener hoogher Christelijcke overheid in kerckelijkcke zaken) he sent Grotius a copy out of friendship. This was a work "on the relationship between ecclesiastical and secular government" from the moderate counter-remonstrant viewpoint. In early 1616 Grotius also received the 36 page letter championing a remonstrant view Dissertatio epistolica de Iure magistratus in rebus ecclesiasticis from his friend Gerardus Vossius.
The letter was "a general introduction on (in)tolerance, mainly on the subject of predestination and the sacrament...[and] an extensive, detailed and generally unfavourable review of Walaeus' Ampt, stuffed with references to ancient and modern authorities." When Grotius wrote asking for some notes "he received a treasure-house of ecclesiastical history. ...offering ammunition to Grotius, who gratefully accepted it". Around this time (April 1616) Grotius went to Amsterdam as part of his official duties, trying to persuade the civil authorities there to join Holland's majority view about church politics.
In early 1617 Grotius debated the question of giving counter-remonstrants the chance to preach in the Kloosterkerk in The Hague which had been closed. During this time lawsuits were brought against the States of Holland by counter-remonstrant ministers and riots over the controversy broke out in Amsterdam.
De Imperio Summarum Potestatum circa Sacra
As the conflict between civil and religious authorities escalated, in order to maintain civil order Oldenbarnevelt eventually proposed that local authorities be given the power to raise troops (the Sharp Resolution of August 4, 1617). Such a measure putatively undermined the authority of the stadtholder of the republic, Maurice of Nassau, Prince of Orange. Maurice seized the opportunity to solidify the preeminence of the Gomarists, whom he had supported, and to eliminate the nuisance he perceived in Oldenbarnevelt (the latter had previously brokered the Twelve Years' Truce with Spain in 1609 against Maurice's wishes). During this time Grotius made another attempt to address ecclesiastical politics by completing De Imperio Summarum Potestatum circa Sacra, on "the relations between the religious and secular authorities...Grotius had even cherished hopes that publication of this book would turn the tide and bring back peace to church and state".
As the religious dispute between the Remonstrants and the Counter-Remonstrants became increasingly heated during the Twelve Years’ Truce (1609–1621), riots broke out. A national synod, the Synod of Dort, was convened to settle the dispute and in 1619, it outlawed Arminianism. Remonstrant members of the States of Holland including Johan van Oldenbarnevelt and Hugo Grotius were immediately arrested and imprisoned. After half a year in remand, sentences were passed. Van Oldenbarnevelt was sentenced to death and was beheaded in 1619. Grotius was controversially sentenced to life imprisonment and transferred to Loevestein Castle.
From his imprisonment in Loevestein, Grotius made a written justification of his position "as to my views on the power of the Christian [civil] authorities in ecclesiastical matters, I refer to my...booklet De Pietate Ordinum Hollandiae and especially to an unpublished book De Imperio summarum potestatum circa sacra, where I have treated the matter in more detail...I may summarize my feelings thus: that the [civil] authorities should scrutinize God's Word so thoroughly as to be certain to impose nothing which is against it; if they act in this way, they shall in good conscience have control of the public churches and public worship – but without persecuting those who err from the right way." Because this stripped Church officials of any power some of their members (such as Johannes Althusius in a letter to Lubbertus) declared Grotius' ideas diabolical.
In 1621, with the help of his wife and his maidservant, Elsje van Houwening, Grotius managed to escape the castle in a book chest and fled to Paris. In the Netherlands today, he is mainly famous for this daring escape. Both the Rijksmuseum in Amsterdam and the museum Het Prinsenhof in Delft claim to have the original book chest in their collection.
Grotius was well received in Paris by his former acquaintances and was granted a royal pension under Louis XIII. It was there in France that Grotius completed his most famous philosophical works.
On The Truth of the Christian Religion
While in Paris, Grotius set about rendering into Latin prose a work which he had originally written as Dutch verse in prison, providing rudimentary yet systematic arguments for the truth of Christianity. The Dutch poem, Bewijs van den waren Godsdienst, was published in 1622, the Latin treatise in 1627, under the title De veritate religionis Christianae.
Governmental theory of atonement
Grotius also developed a particular view of the atonement of Christ known as the "Governmental" or "Moral government" theory. He theorized that Jesus' sacrificial death occurred in order for the Father to forgive while still maintaining his just rule over the universe. This idea, further developed by theologians such as John Miley, became one of the prominent views of the atonement in Methodist Arminianism.
De Jure Belli ac Pacis
Living in the times of the Eighty Years' War between Spain and the Netherlands and the Thirty Years' War between Catholic and Protestant European nations (Catholic France being in the otherwise Protestant camp), it is not surprising that Grotius was deeply concerned with matters of conflicts between nations and religions. His most lasting work, begun in prison and published during his exile in Paris, was a monumental effort to restrain such conflicts on the basis of a broad moral consensus. Grotius wrote:
Fully convinced...that there is a common law among nations, which is valid alike for war and in war, I have had many and weighty reasons for undertaking to write upon the subject. Throughout the Christian world I observed a lack of restraint in relation to war, such as even barbarous races should be ashamed of; I observed that men rush to arms for slight causes, or no cause at all, and that when arms have once been taken up there is no longer any respect for law, divine or human; it is as if, in accordance with a general decree, frenzy had openly been let loose for the committing of all crimes.
De jure belli ac pacis libri tres (On the Law of War and Peace: Three books) was first published in 1625, dedicated to Grotius' current patron, Louis XIII. The treatise advances a system of principles of natural law, which are held to be binding on all people and nations regardless of local custom. The work is divided into three books:
- Book I advances his conception of war and of natural justice, arguing that there are some circumstances in which war is justifiable.
- Book II identifies three 'just causes' for war: self-defense, reparation of injury, and punishment; Grotius considers a wide variety of circumstances under which these rights of war attach and when they do not.
- Book III takes up the question of what rules govern the conduct of war once it has begun; influentially, Grotius argued that all parties to war are bound by such rules, whether their cause is just or not.
Grotius' concept of natural law had a strong impact on the philosophical and theological debates and political developments of the 17th and 18th centuries. Among those he influenced were Samuel Pufendorf and John Locke, and by way of these philosophers his thinking became part of the cultural background of the Glorious Revolution in England and the American Revolution. In Grotius' understanding, nature was not an entity in itself, but God's creation. Therefore, his concept of natural law had a theological foundation. The Old Testament contained moral precepts (e.g. the Decalogue), which Christ confirmed and therefore were still valid. They were useful in interpreting the content of natural law. Both biblical revelation and natural law originated in God and could therefore not contradict each other.
Many exiled Remonstrants began to return to the Netherlands after the death of Prince Maurice in 1625 when toleration was granted to them. In 1630 they were allowed complete freedom to build and run churches and schools and to live anywhere in Holland. The Remonstrants guided by Uytenbogaert set up a presbyterial organization. They established a theological seminary at Amsterdam where Grotius came to teach alongside Episcopius, Limborch, Curcellaeus, and Le Clerc.
In 1634 Grotius was given the opportunity to serve as Sweden's ambassador to France. The recently deceased Swedish king, Gustavus Adolphus had been an admirer of Grotius (he was said to have always carried a copy of De jure belli ac pacis in his saddle when leading his troops). His successor's regent, Axel Oxenstierna, was keen to have Grotius in his employ. Grotius accepted the offer and took up diplomatic residence in Paris, which remained his home until he was released from his post in 1645.
While departing from his last visit to Sweden, Grotius was shipwrecked on the voyage. He washed up on the shore of Rostock, ill and weather-beaten, and on August 28, 1645, he died; his body at last returned to the country of his youth, being laid to rest in the Nieuwe Kerk in Delft.
Grotius' personal motto was Ruit hora ("Time is running away"); his last words were "By understanding many things, I have accomplished nothing" (Door veel te begrijpen, heb ik niets bereikt). Significant friends and acquaintances of his included the theologian Franciscus Junius, the poet Daniel Heinsius, the philologist Gerhard Johann Vossius, the historian Johannes Meursius, the engineer Simon Stevin, the historian Jacques Auguste de Thou, and the Orientalist and Arabic scholar Erpinius. He was also friends with the Flemish Jesuit Andreas Schottus.
Grotius was the father of regent and diplomat Pieter de Groot.
Commentary on Grotius
Into the very midst of all this welter of evil, at a point in time to all appearance hopeless, at a point in space apparently defenseless, in a nation of which every man, woman, and child was under sentence of death from its sovereign, was born a man who wrought as no other has ever done for a redemption of civilization from the main cause of all that misery; who thought out for Europe the precepts of right reason in international law; who made them heard; who gave a noble change to the course of human affairs; whose thoughts, reasonings, suggestions, and appeals produced an environment in which came an evolution of humanity that still continues.
In contrast, Robert A. Heinlein satirized the Grotian governmental approach to theology in Methuselah's Children: "There is an old, old story about a theologian who was asked to reconcile the doctrine of Divine Mercy with the doctrine of infant damnation. 'The Almighty,' he explained, 'finds it necessary to do things in His official and public capacity which in His private and personal capacity He deplores.'"
The Peace Palace Library in The Hague holds the Grotius Collection, which has a large number of books by and about Hugo Grotius. The collection was based on a donation from Martinus Nijhoff of 55 editions of De jure belli ac pacis libri tres.
Works are listed in order of publication, with the exception of works published posthumously or after long delay (estimated composition dates are given). Where an English translation is available, the most recently published translation is listed beneath the title.
- Adamus exul (The Exile of Adam; tragedy) – The Hague, 1601
- De republica emendanda (To Improve the Dutch Republic; manuscript 1601) – pub. The Hague, 1984
- Parallelon rerumpublicarum (Comparison of Constitutions; manuscript 1601–02) – pub. Haarlem 1801–03
- De Indis (On the Indies; manuscript 1604–05) – pub. 1868 as De Jure Praedae
- Christus patiens (The Passion of Christ; tragedy) – Leiden, 1608
- Mare Liberum (The Free Seas; from chapter 12 of De Indis) – Leiden, 1609
- De antiquitate reipublicae Batavicae (On the Antiquity of the Batavian Republic) – Leiden, 1610
- The Antiquity of the Batavian Republic, ed. Jan Waszink and others (van Gorcum, 2000).
- Meletius (manuscript 1611) – pub. Leiden, 1988
- Meletius, ed. G.H.M. Posthumus Meyjes (Brill, 1988).
- Annales et Historiae de rebus Belgicis (Annals and History of the Low Countries' War; manuscript 1612-13) – pub. Amsterdam, 1657
- The Annals and History of the Low-Countrey-warrs, ed. Thomas Manley (London, 1665):
- Modern Dutch translation of the "Annales" only in: Hugo de Groot, "Kroniek van de Nederlandse Oorlog. De Opstand 1559-1588", ed. Jan Waszink (Nijmegen, Vantilt 2014), with introduction, index, plates.
- Ordinum Hollandiae ac Westfrisiae pietas (The Piety of the States of Holland and Westfriesland) – Leiden, 1613
- Ordinum Hollandiae ac Westfrisiae pietas, ed. Edwin Rabbie (Brill, 1995).
- De imperio summarum potestatum circa sacra (On the power of sovereigns concerning religious affairs; manuscript 1614–17) – pub. Paris, 1647
- De imperio summarum potestatum circa sacra, ed. Harm-Jan van Dam (Brill, 2001).
- De satisfactione Christi adversus Faustum Socinum (On the satisfaction of Christ against [the doctrines of] Faustus Socinus) – Leiden, 1617
- Defensio fidei catholicae de satisfactione Christi, ed. Edwin Rabbie (van Gorcum, 1990).
- A defence of the Catholic faith concerning the satisfaction of Christ against Faustus Socinus, tr. Frank Hugh Foster (W. F. Draper, 1889).
- Inleydinge tot de Hollantsche rechtsgeleertheit (Introduction to Dutch Jurisprudence; written in Loevenstein) – pub. The Hague, 1631
- The Jurisprudence of Holland, ed. R.W. Lee (Oxford, 1926).
- Bewijs van den waaren godsdienst (Proof of the True Religion; didactic poem) – Rotterdam, 1622
- Apologeticus (Defense of the actions which led to his arrest) – Paris, 1922
- De jure belli ac pacis (On the Law of War and Peace) – Paris, 1625 (2nd ed. Amsterdam 1631)
- De veritate religionis Christianae (On the Truth of the Christian religion) – Paris, 1627
- The Truth of the Christian Religion, ed. John Clarke (Edinburgh, 1819).
- Sophompaneas (Joseph; tragedy) – Amsterdam, 1635
- De origine gentium Americanarum dissertatio (Dissertation of the origin of the American peoples) – Paris 1642
- Via ad pacem ecclesiasticam (The way to religious peace) – Paris, 1642
- Annotationes in Vetus Testamentum (Commentaries on the Old Testament) – Amsterdam, 1644
- Annotationes in Novum Testamentum (Commentaries on the New Testament) – Amsterdam and Paris, 1641–50
- De fato (On Destiny) – Paris, 1648
- Coenraad van Beuningen
- Emer de Vattel
- English school of international relations theory
- International waters
- Hedley Bull; Adam Roberts; Benedict Kingsbury) (eds.). Hugo Grotius and International Relations. Oxford: Oxford UP. ISBN 978-0-19-825569-7.
- Thumfart (2009)
- See Vreeland (1919), chapter 1
- Stahl, William H. (1965). "To a Better Understanding of Martianus Capella". Speculum. 40 (1): 102–115. doi:10.2307/2856467. JSTOR 2856467.
- "Hugo Grotius". www.tititudorancea.com. Retrieved 2018-11-22.
- See Ittersum (2006), chapter 1.
- Selden, John. Needham, Marchmont (trans.) (1652) Mare Clausum. Of the Dominion, or, Ownership of the Sea. Vols. 1 & 2. London: Printed by William Du-Gard, by appointment of the Council of State and sold at the Sign of the Ship at the New Exchange.
- Vreeland (1919), chapter 3.
- Edwin Rabbie (1995). Hugo Grotius: Ordinum Hollandiae ac Westfrisiae Pietas, 1613. Brill.
- Willem Nijenhuis (1972–1994). Ecclesia reformata: Studies on the Reformation. Leiden, Netherlands: Brill.
- Harm-Jan Van Dam (1994). "De Imperio Summarum Potestatum Circa Sacra". In Henk J.M. Nellen & Edwin Rabbie. Hugo Grotius Theologian – Essays in Honor of G.H.M. Posthumus Meyjes. New York: E.J. Brill.
- A translation edict is printed in full in the appendix to Vreeland (1919).
- See his manuscript for Meletius (1611) and the more systematic De imperio summarum potestatum circa sacra (finished 1617, published 1647).
- Hans W. Blom, ed. (2009). Property, Piracy and Punishment: Hugo Grotius on War and Booty in De iure praedae. Brill.
- Arthur Nussbaum (1947). A concise history of the law of nations. Macmillan Co. p. 62.
- "Hugo Grotius". Slot Loevestein. Retrieved 2017-03-23.
- "Hugo de Groot - Slot Loevestein". Slot Loevestein (in Dutch). Retrieved 2017-01-23.
- The Law of War and Peace, trans. Francis Kelsey (Carnegie edition, 1925), Prol. sect. 28.
- Cf. Jeremy Waldron (2002), God, Locke, and Equality: Christian Foundations in Locke's Political Thought, Cambridge University Press, Cambridge (UK), ISBN 978-0-521-89057-1, pp. 189, 208
- Ernst Wolf, Naturrecht, in Die Religion in Geschichte und Gegenwart, 3. Auflage, Band IV (1960), Tübingen (Germany), col. 1357
- M. Elze, Grotius, Hugo, in Die Religion in Geschichte und Gegenwart, 3. Auflage, Band II (1958), Tübingen (Germany), col. 1885
- Grotius, Hugo The Rights of War and Peace Book I, Project Gutenberg.
- Bill Uzgalis, "Hugo Grotius" in Western Philosophers, Oregon State online notes (2003) Archived 20 October 2011 at the Wayback Machine.
- Guillaume H.M. Posthumus Meyjes (ed.), Hugo Grotius, Meletius sive De iis quae inter Christianos conveniunt Epistola: Critical Edition with Translation, Commentary and Introduction, Brill 1988, p. 33, n. 67
- Robert A. Heinlein (1958/1999), Revolt in 2100 & Methuselah's Children, reprint, Riverdale, New York: Baen, Chapter 3, pp. 324–325.
- See Catalogue of the Grotius Collection (Peace Palace Library, The Hague) and 'Grotius, Hugo' in Dictionary of Seventeenth Century Dutch Philosophers (Thoemmes Press 2003).
- An extension of François Vranck's Deduction of 1587, see Leeb, I. Leonard (1973). Ideological Origins of the Batavian Revolution: History and Politics in the Dutch Republic, 1747–1800. Springer. pp. 21ff, 89.
- This was for a long time the only source for what transpired during Grotius' trial in 1619, because the trial record was not published at the time. However, Robert Fruin edited this trial record in R. Fruin, ed. (1871). "Verhooren en andere bescheiden betreffende het rechtsgeding van Hugo de Groot". Google Books (in Dutch). Kemink en Zn. Retrieved 26 January 2019.
- van Ittersum, Martine Julia (2006). Hugo Grotius, Natural Rights Theories and the Rise of Dutch Power in the East Indies 1595–1615. Boston: Brill. ISBN 978-90-04-14979-3.
- Vreeland, Hamilton (1917). Hugo Grotius: The Father of the Modern Science of International Law. New York: Oxford University Press. ISBN 978-0-8377-2702-8. Retrieved 16 February 2019 – via Internet Archive.
- Bayle, Pierre. (1720). "Grotius", in Dictionaire historique et critique, 3rd ed. (Rotterdam: Michel Bohm).
- Alvarado, Ruben. The Debate that Changed the West: Grotius versus Althusius (Aalten: Pantocrator Press, 2018).
- Bell, Jordy: Hugo Grotius: Historian. Ann Arbor, MI: University Microfilms, 1980
- Blom, Hans W. (ed.): Property, Piracy and Punishment: Hugo Grotius on War and Booty in De Iure Praedae – Concepts and Contexts. Leiden, BRILL, 2009, 416pp
- Blom, H. W.; Winkel, L. C.: Grotius and the Stoa. Van Gorcum Ltd, 2004, 332pp
- Borschberg, Peter, 2011, Hugo Grotius, the Portuguese and Free Trade in the East Indies, Singapore and Leiden: Singapore University Press and KITLV Press.
- Brandt, Reinhard: Eigentumstheorien von Grotius bis Kant (Problemata). Stuttgart-Bad Cannstatt: Frommann-Holzboog, 1974, 275pp
- Buckle, Stephen: Natural Law and the Theory of Property: Grotius to Hume. Oxford University Press, USA, 1993, 344pp
- Hedley Bull, Benedict Kingsbury and Adam Roberts, eds., 1990. Hugo Grotius and International Relations. Oxford Univ. Press.
- Burigny, Jean Lévesque de: The Life of the Truly Eminent and Learned Hugo Grotius: Containing a Copious and Circumstantial History of the Several Important and Honourable Negotiations in Which He was Employed; Together with a Critical Account of His Works. London: printed for A. Millar, 1754. Also Echo Library, 2006.
- Butler, Charles: The Life of Hugo Grotius: With Brief Minutes of the Civil, Ecclesiastical, and Literary History of the Netherlands. London: John Murray, 1826.
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|Wikisource has original works written by or about:|
- Works by Hugo Grotius at Project Gutenberg
- Works by or about Hugo Grotius at Internet Archive
- Works by Hugo Grotius at LibriVox (public domain audiobooks)
- Works by Hugo Grotius at Post-Reformation Digital Library
- Works by Hugo Grotius in Short Title Catalogue Netherlands (STCN)
Individual works by Grotius
- On the Laws of War and Peace (abridged)
- On the Laws of War and Peace (Latin, first edition 1625)
- Logicarum disputationum quarta de postpraedicamentis; disputation, aged 14, at Leiden University
- Physicarum disputationum septima de infinito, loco et vacuo; disputation, aged 14, at Leiden University
- Extensive catalogue of Grotius' writings at the Peace Palace Library, The Hague
- The Correspondence of Hugo de Groot (Grotius) in EMLO
- Blom, Andrew. "Hugo Grotius". Internet Encyclopedia of Philosophy.
- Miller, Jon. "Hugo Grotius". In Zalta, Edward N. Stanford Encyclopedia of Philosophy.
- Hugo Grotius' Quotes