Dominium maris baltici
The establishment of a dominium maris baltici ("Baltic Sea dominion") was one of the primary political aims of the Danish and Swedish kingdoms in the late medieval and Early Modern eras. In the struggle for the dominium maris baltici (Northern Wars), the Danish and Swedish navies played a secondary role, as the dominium was to be won by control of key coasts by land warfare.
The term, which is commonly used in historiography, was probably coined in 1563 by the king and grand duke of the Polish-Lithuanian union, Sigismund II Augustus, referring to the hegemonial ambitions of his adversaries in the Livonian War. The first written reference stems from the Dutch-Swedish treaty of 5 (O.S.) / 15 (N.S.) April 1614, concluded in The Hague.[nb 1]
Wars over the Baltic 
The Baltic sea was vital for many European powers. It was a source for important materials, and a growing market for many commodities. The importance of the region was such that it was of interest even to powers that did not have direct access to it, such as Austria and France. For several centuries, Sweden and Denmark would attempt to gain the total control of the sea, a policy that was opposed by other local and international powers. The control of the Baltic has been described as one of the main goals of the Denmark's and Sweden's policies.
The conflict over the Baltic was heavily shaped by the expansionist policy of the Scandinavian (Nordic) powers, who sensed opportunity in the power vacuum created by the weak or non-existent naval power of the Holy Roman Empire and Poland-Lithuania. Denmark and Sweden used their control of parts of the Baltic to fuel their militaries. Both claimed the Baltic as theirs, and promised to protect foreign shipping. While the Nordic powers vied with one another over control, they both agreed that it should be the domain of one of them, not an "outsider", like Poland or Russia. The Scandinavian powers tried to prevent the rise of the opposition through diplomatic treaties, in which other powers like Russia or Germany were forbidden to create their navies, and through military actions, whether targeting opponent naval forces, or through taking control of the Baltic ports. In one of the most notable actions to retain its monopoly over the Baltic, Denmark destroyed, without declaration of war, the nascent Polish-Lithuanian Commonwealth Navy in 1637.
The numerous wars fought for the dominium maris baltici are often collectively referred to as Northern Wars. Early on, Denmark had the upper hand, but eventually, it lost to Sweden. Neither Denmark nor Sweden managed to realize thorough military and economic control of the Baltic, though Sweden during her time as an empire came closest to that aim before the Great Northern War.
Danish dominium maris baltici 
In historiography, the term dominium maris baltici is used either in a narrower sense as a new Swedish concept of the Early Modern era, closely tied to the Swedish Empire, or in a wider sense including the preceding Danish hegemony in the southern Baltic Sea.
Dernmark had subdued the southern Baltic coast in the 12th century, but lost control in the 13th century after her defeat in the Battle of Bornhöved (1227), with the exception of the principality of Rügen. Thereafter, the Hanseatic League became the dominant economic power in the Baltic Sea. Valdemar IV "Atterdag" of Denmark is credited by Robert Bohn as the first Danish king pursuing a policy of establishing a Danish dominium maris baltici, aiming at adding to Denmark's naval dominance an economical hegemony at the expense of the Hanseatic League. To achieve this aim, Valdemar sold Danish Estonia to the Teutonic Order state in 1346, consolidating his finances and raising an army from the revenue. After initial territorial gains, Valdemar conquered the Hanseatic town of Visby (Gotland), resulting in a war decided by the League in the peace of Stralsund in 1370, which marked the climax of Hanseatic power.
Atterdag's daughter and de facto successor, Lady Margaret, managed to concentrate the crowns of Denmark, Norway and Sweden in her Copenhagen-centered Kalmar Union. In 1429, Kalmar king Eric of Pomerania started to raise the Sound Dues from merchants entering or leaving the Baltic Sea, allowing the Copenhagen court to benefit from the Baltic Sea trade profits without engaging in economic adventures itself. The Sound Dues, imposed until 1857 and constituting a primary source of income for the Royal treasury, quickly became a contentious issue which brought Denmark in conflict with the Hanseatic League and the neighboring powers.
After the break-up of the Kalmar Union, the Kingdom of Sweden became Denmark-Norway's primary rival for hegemony in the Baltic Sea. Christian IV of Denmark's victiory in the Kalmar War in 1613 marked the last instance of a successful defense of the dominium maris baltici against Sweden, while the subsequent wars ended in favor of the latter. The period of Danish intervention in the Thirty Years' War (Kejserkrig) is also considered part of the wars for the dominium maris baltici—in this war, however, the opponent was not the Swedish king, but the ambitious Holy Roman Emperor Ferdinand II, who temporarily planned to establish the empire as a naval power in the Baltic. He assigned this task to Albrecht von Wallenstein, leading to a concerted action of Denmark and Sweden in the defense of Stralsund. The Danish defeat in the battle of Wolgast and the subsequent treaty of Lübeck in 1629 however removed Denmark from the battlefield.
Swedish dominium maris baltici 
After Sweden had become independent from the Kalmar union, she became Denmark's major rival for the dominium maris baltici. The first war ascribed to this conflict is the Northern Seven Years' War (1563–1570, associated with the Livonian War), between 1611 and 1613 followed the above mentioned Kalmar War. Major Swedish successes followed the capture of Riga in 1621 and the Swedish landing in Pomerania in 1630. The gains in the Torstenson War, a theater of the Thirty Years' War, humiliated Denmark, and the subsequent Peace of Westphalia confirmed Sweden's status as a European great power (stormaktstiden). Swedish control of the Baltic was not thorough, however, since the Maritime Powers, especially Dutch Republic, continued to be economically and militarily present and pursued their balance of power policy also in respect to Denmark and Sweden. The Second Northern War, the Scanian War and the first stage of the Great Northern War left Sweden's dominium maris baltici intact, yet it was finally ended by the Treaty of Nystad in 1721. Sweden had sought to secure her dominium maris baltici by turning many towns (e.g. Riga, Narva, Wismar) into fortresses, often under the aegis of Erik Dahlberg. Since the Thirty Years' War, Sweden collected customs (Licenten) from merchant vessels on the Baltic Sea, in Swedish as well as in non-Swedish ports. These customs were calculated as a certain percentage of the value of transported goods, and once payment took place in any port, the respective receipt was valid for the whole dominium maris baltici.
|Contested Baltic Sea coastal regions, islands and straits of Sweden's dominium maris baltici|
|Scania||Helsingborg||Scania, along with the adjacent provinces, was ceded to Sweden by the Kingdom of Denmark in the Treaty of Roskilde in 1658, during the Second Northern War.|
|Blekinge||Karlskrona||Karlskrona founded in 1680 as primary Swedish naval base after Blekinge was ceded to Sweden by the Kingdom of Denmark in the Treaty of Roskilde in 1658, during the Second Northern War.|
|Mecklenburg||Wismar||Swedish occupation and custums since 1632, Swedish dominion after the Peace of Westphalia, Danish occupation in 1675 (Scanian War), restored to Sweden in the Peace of Lund (1679), thereafter Swedish fortress, occupied by Danish, Hanoveranian and Brandenburgian forces during the Great Northern War, restored to Sweden under the caveat that the fortifications were razed, reduced in significance and pawned by Sweden to Mecklenburg-Schwerin in 1803|
|Rostock||Warnemünde, controlling the entry to the Rostock port, was ceded to Sweden in 1632 (Thirty Years' War), fortified and served to raise customs until 1714|
|Pomerania||Stralsund||Swedish garrison since the battle of Stralsund (1628) (Thirty Years' War), remained in Swedish Pomerania until 1815|
|Greifswald||nominally under Swedish military control after the Treaty of Stettin (1630), conquered in 1631 (Thirty Years' War), remained in Swedish Pomerania until 1815|
|Stettin (Szczecin)||control of Oder trade, under Swedish military control after the Treaty of Stettin (1630, during the Thirty Years' War), remained in Swedish Pomerania until the 1720 Treaty of Stockholm (Great Northern War)|
|Kolberg (Kołobrzeg)||most important of the relatively minor Farther Pomeranian ports, which all came under Swedish military control following the Treaty of Stettin (1630). While ceded to the Brandenburg-Prussian Province of Pomerania (1653-1815) in the Treaty of Stettin (1653), Sweden retained a share of the customs.|
|Prussia||Danzig (Gdańsk)||controls the Vistula trade, principal port of the Polish-Lithuanian Commonwealth (Royal Prussia region). Major trading point for the Dutch merchant fleets. Swedish customs following the Truce of Altmark (1629). Navy destroyed.|
|Elbing (Elbląg)||a port in the Polish-Lithuanian Commonwealth (Royal Prussia region). Swedish occupation and customs during and after the Polish–Swedish War (1626–1629), concluded by the Truce of Altmark (1629). Again during the Second Northern War, when it was also the site of a Dutch-Swedish agreement on Dutch rights in the Baltic Sea (Treaty of Elbing, 1659). Swedish troops cleared the city in 1660, following the Treaty of Bromberg.|
|Königsberg (Królewiec, Kaliningrad)||a port of the Duchy of Prussia, vassal of the Commonwealth. Swedish customs following the Truce of Altmark (1629), Swedish vassalage of the Duchy of Prussia by the Treaty of Königsberg (1656), succeeded by the Prusso-Swedish alliance of Marienburg and its break-up in the Treaty of Bromberg, all during the Second Northern War|
|Pillau (Piława, Baltisk)||a port of the Duchy of Prussia, vassal of the Commonwealth. Swedish occupation and customs during and after the Polish–Swedish War (1626–1629), concluded by the Truce of Altmark (1629), Swedish vassalage of the Duchy of Prussia by the Treaty of Königsberg (1656), succeeded by the Prusso-Swedish alliance of Marienburg and its break-up in the Treaty of Bromberg, all during the Second Northern War|
|Livonia||Riga||controls the Düna (Daugava) trade (Livonian hinterland and Russia). Under Commonwealth control till Swedish conquest in 1621, remained in Swedish Livonia until the capitulation of Estonia and Livonia in 1710, formalized in the Treaty of Nystad in 1721.|
|Pernau (Pärnu)||under Commonwealth control till 1617; in Swedish Livonia until the capitulation of Estonia and Livonia in 1710, formalized in the Treaty of Nystad in 1721.|
|Estonia and Ingermanland||Reval (Tallinn)||subordinated itself to Sweden in 1561 (Livonian War), remained in Swedish Estonia until the capitulation of Estonia and Livonia in 1710, formalized in the Treaty of Nystad in 1721.|
|Narva||important hub for Russian trade. Russian control from 1558 to 1581, Swedish afterward, retaken by the Russians in 1704|
|Gotland (Gothland)||ceded to Sweden by Denmark in the Second Treaty of Brömsebro (1645), after the Torstenson War|
|Ösel (Øsel, Saaremaa)||ceded to Sweden by Denmark in the Second Treaty of Brömsebro (1645), after the Torstenson War|
|Bornholm||temporarily conquered by Sweden in 1645 (Torstenson War), ceded to Sweden by Denmark in the Treaty of Roskilde (1658), during the Second Northern War, restored to Denmark by the Treaty of Copenhagen (1660)|
|Rügen (Rygen, Rugen)||under Swedish military control after the Treaty of Stettin (1630) (Thirty Years' War), remained in Swedish Pomerania until 1815|
|Öresund (Øresund, "The Sound")||entrance to the Baltic Sea, both coasts under Danish control until 1658, Sweden exempted from the Danish Sound Dues after the Second Treaty of Brömsebro (1645) (Torstenson War), eastern coast Swedish since the Treaty of Roskilde (1658, see Scania entry)|
The failure of the Scandinavian powers to take control of the Baltic, and steadfast refusal of other powers – local and international – to recognize their claims, is seen as one of the factors that led to the development of the "freedom of the seas" principle in the international law.
See also 
- Dominium Maris Septentrionalis (dominion of the northern seas)
- Treaty of The Hague, 5 (15) April 1614, article VIII of the Dutch version: "[...] sijne Koninghlijcke Majesteyt ende de Croon Sweeden, in haere Hoogheydt, Regalien, Rechten, Dominio Maris Baltici [...]" ("the sovereignty, regalia, rights, dominium maris baltici [...] of His Royal Majesty and the Swedish Crown", i.e. Gustavus Adolphus of Sweden). printed in DuMont: Recueil des traitez d'alliance tome V, 1728, p. 248.
- C. R. L. Fletcher (1890). Gustavus Adolphus and the struggle of Protentantism for existence. p. 4. Retrieved 7 June 2011.
- Hanno Brand; Leos Müller (2007). The dynamics of economic culture in the North Sea and Baltic Region: in the late Middle Ages and early modern period. Uitgeverij Verloren. p. 20. ISBN 978-90-6550-882-9. Retrieved 7 June 2011.
- Meier, Martin (2008). Vorpommern nördlich der Peene unter dänischer Verwaltung 1715 bis 1721: Aufbau einer Verwaltung und Herrschaftssicherung in einem eroberten Gebiet (in German). Oldenbourg Wissenschaftsverlag. p. 16. ISBN 3-486-58285-2.
- Michael Roberts (27 April 1984). The Swedish Imperial Experience 1560–1718. Cambridge University Press. pp. 16–17. ISBN 978-0-521-27889-8. Retrieved 7 June 2011.
- Renate Platzöder; Philomène A. Verlaan (1996). The Baltic Sea: new developments in national policies and international cooperation. Martinus Nijhoff Publishers. pp. 41–42. ISBN 978-90-411-0357-4. Retrieved 7 June 2011.
- Heinz Duchhardt; Eva Ortlieb (1998). Der Westfälische Friede. Oldenbourg Wissenschaftsverlag. p. 362. ISBN 978-3-486-56328-3. Retrieved 7 June 2011.
- Veronica Buckley (15 September 2005). Christina, Queen of Sweden: The Restless Life of a European Eccentric. HarperCollins. p. 41. ISBN 978-0-06-073618-7. Retrieved 7 June 2011.
- Susanna Åkerman (1998). Rose cross over the Baltic: the spread of rosicrucianism in Northern Europe. BRILL. p. 33. ISBN 978-90-04-11030-4. Retrieved 7 June 2011.
- Geoffrey Parker (1997). The Thirty Years' War. Psychology Press. p. 49. ISBN 978-0-415-12883-4. Retrieved 7 June 2011.
- Michael Roberts (27 April 1984). The Swedish Imperial Experience 1560–1718. Cambridge University Press. p. 18. ISBN 978-0-521-27889-8. Retrieved 7 June 2011.
- Ernest R. May; Richard Rosecrance; Zara Steiner (30 November 2010). History and Neorealism. Cambridge University Press. p. 95. ISBN 978-0-521-13224-4. Retrieved 7 June 2011.
- Maija Jansson (6 March 2007). Realities of representation: state building in early modern Europe and European America. Macmillan. p. 136. ISBN 978-1-4039-7534-8. Retrieved 7 June 2011.
- Schröter, Harm G. (2007). Geschichte Skandinaviens (in German). C.H.Beck. p. 40. ISBN 3-406-53622-0.
- Bohn, p. 30
- Bohn, p. 31
- Bohn, pp. 32–34
- Bohn, p. 35
- Bohn, p. 36
- Asche, Matthias et al., ed. (2003). Dänemark, Norwegen und Schweden im Zeitalter der Reformation und Konfessionalisierung. Nordische Königreiche und Konfession 1500 bis 1660. Aschendorff. p. 84. ISBN 3-402-02983-9.
- Olesen, p. 383
- Olesen, p. 394
- Olesen, Jens E. (2003). "Christian IV og dansk Pommernpolitik". In Asmus, Ivo; Droste, Jens E.; Olesen. Gemeinsame Bekannte: Schweden und Deutschland in der Frühen Neuzeit (in Danish). Berlin-Hamburg-Münster: LIT Verlag. p. 385. ISBN 3-8258-7150-9.
- Wahrmann, pp. 36–38
- Wahrmann, p. 42
- Wahrmann, p. 43
- Wahrmann, p. 36
- Wahrmann, p. 38
- Wahrmann, p. 39
- Zeitschrift des Vereins für Lübeckische Geschichte und Altertumskunde (in German) 85. 2005. p. 187. ISBN 3-7950-1484-0.
- Bohn, Robert (2001). Dänische Geschichte (in German). C.H.Beck. ISBN 3-406-44762-7.
- Olesen, Jens E. (2003). "Christian IV og dansk Pommernpolitik". In Asmus, Ivo; Droste, Jens E.; Olesen. Gemeinsame Bekannte: Schweden und Deutschland in der Frühen Neuzeit (in Danish). Berlin-Hamburg-Münster: LIT Verlag. ISBN 3-8258-7150-9.
- Wahrmann, Carl (2007). Aufschwung und Niedergang. Die Entwicklung des Wismarer Seehandels in der zweiten Hälfte des 17. Jahrhunderts (in German). Münster: LIT. ISBN 3-8258-0098-9.
Further reading 
- Asche et al.: Die baltischen Lande im Zeitalter der Reformation und Konfessionalisierung, vol. I, 2009, p. 39.
- Pineschi & Treves: The law of the sea. The European Union and its member states, 1997, p. 513.
- Schilling: Konfessionalisierung und Staatsinteressen. Internationale Beziehungen 1559–1660, 2007, pp. 308 ff.
- Troebst: Handelskontrolle, "Derivation", Eindämmerung. Schwedische Moskaupolitik 1617–1661, 1997, p. 304.