Chaos (Greek χάος, khaos) refers to the void state preceding the creation of the universe or cosmos in the Greek creation myths, or to the initial "gap" created by the original separation of heaven and earth. In Hesiod's Theogony (c. 700 BC), Chaos was the first of the primordial deities, followed by Gaia (Earth), Tartarus (the nether abyss), and Eros (Love). From Chaos came Erebus (Darkness) and Nyx (Night).
Greek χάος means "emptiness, vast void, chasm, abyss", from the verb χαίνω, "gape, be wide open, etc.", from Proto-Indo-European *ǵheh2n-, cognate to Old English geanian, "to gape", whence English yawn. It may also mean space, the expanse of air, and the nether abyss, infinite darkness. Pherecydes of Syros (fl. 6th century BC) interprets chaos as water, like something formless which can be differentiated.
Hesiod and the Pre-Socratics use the Greek term in the context of cosmogony. Hesiod's chaos has been interpreted as either "the gaping void above the Earth created when Earth and Sky are separated from their primordial unity" or "the gaping space below the Earth on which Earth rests".
In Hesiod, Chaos was the first thing to exist: "at first Chaos came to be" (or was) "but next" (possibly out of Chaos) came Gaia, Tartarus, and Eros (elsewhere the son of Aphrodite). Unambiguously born "from Chaos" were Erebus (Darkness) and Nyx (Night). For Hesiod, Chaos, like Tartarus, though personified enough to have borne children, was also a place, far away, underground and "gloomy", beyond which lived the Titans. And, like the earth, the ocean, and the upper air, it was also capable of being affected by Zeus' thunderbolts.
Passages in Hesiod's Theogony suggest that Chaos was located below Earth but above Tartarus. Primal Chaos was sometimes said to be the true foundation of reality, particularly by philosophers such as Heraclitus.
The notion of the temporal infinity was familiar to the Greek mind from remote antiquity in the religious conception of immortality.[clarification needed] This idea of the divine as an origin[clarification needed] influenced the first Greek philosophers. The main object of the first efforts to explain the world remained the description of its growth, from a beginning. They believed that the world arose out from a primal unity, and that this substance was the permanent base of all its being. Anaximander claims that the origin is apeiron (the unlimited), a divine and perpetual substance less definite than the common elements. Everything is generated from apeiron, and must return there according to necessity. A conception of the nature of the world was that the earth below its surface stretches down indefinitely and has its roots on or above Tartarus, the lower part of the underworld. In a phrase of Xenophanes, "The upper limit of the earth borders on air, near our feet. The lower limit reaches down to the "apeiron" (i.e. the unlimited)." The sources and limits of the earth, the sea, the sky, Tartarus, and all things are located in a great windy-gap, which seems to be infinite, and is a later specification of "chaos".
According to Hyginus: "From Mist (Caligine) came Chaos. From Chaos and Mist, came Night (Nox), Day (Dies), Darkness (Erebus), and Ether (Aether)." An Orphic tradition apparently had Chaos as the son of Chronus and Ananke.
The motif of Chaoskampf (German: [ˈkaːɔsˌkampf], "struggle against chaos") is ubiquitous in myth and legend, depicting a battle of a culture hero deity with a chaos monster, often in the shape of a serpent or dragon. The same term has also been extended to parallel concepts in the Middle East and North Africa, such as the abstract conflict of ideas in the Egyptian duality of Maat and Isfet or the battle of Horus and Set. 
The origins of the Chaoskampf myth most likely lie in the Proto-Indo-European religion whose descendants almost all feature some variation of the story of a storm god fighting a sea serpent representing the clash between the forces of order and chaos. Early work by German academics such as Gunkel and Bousset in comparative mythology popularized translating the mythological sea serpent as a "dragon." Indo-European examples of this mythic trope include Thor vs. Jörmungandr (Norse), Tarḫunz vs. Illuyanka (Hittite), Indra vs. Vritra (Vedic), Θraētaona vs. Aži Dahāka (Avestan) and Zeus vs. Typhon (Greek) among others. Non-Indo-European examples of this trope are Yahweh vs. Leviathan (Hebrew), Susano'o vs. Yamata no Orochi (Japanese) and Mwindo vs. Kirimu (African).
Chaos has been linked with the term abyss/tohu wa-bohu of Genesis 1:2. The term may refer to a state of non-being prior to creation or to a formless state. In the Book of Genesis, the spirit of God is moving upon the face of the waters, and the earliest state of the universe is like a "watery chaos".
The Septuagint makes no use of χάος in the context of creation, instead using the term for gay' גיא, "cleft, gorge, chasm", in Micah 1:6 and Zacharia 14:4. The Vulgate, however, renders the χάσμα μέγα or "great gulf" (between heaven and hell in Luke 16:26 as chaos magnum.
In modern biblical studies, the term chaos is commonly used in the context of the Torah and their cognate narratives in Ancient Near Eastern mythology more generally. Parallels between the Hebrew Genesis and the Babylonian Enuma Elish were established by Hermann Gunkel in 1910. Besides Genesis, other books of the Old Testament, especially a number of Psalms, some passages in Isaiah and Jeremiah and the Book of Job are relevant.
Alchemy and Hermeticism
The Greco-Roman tradition of Prima Materia, notably including the 5th and 6th century Orphic cosmogony, was merged with biblical notions (Tehom) in Christianity and inherited by alchemy and Renaissance magic.
The cosmic egg of Orphism was taken as the raw material for the alchemical magnum opus in early Greek alchemy. The first stage of the process of producing the philosopher's stone, i.e., nigredo, was identified with chaos. Because of association with the Genesis creation narrative, where "the Spirit of God moved upon the face of the waters" (Gen. 1:2), Chaos was further identified with the classical element of Water.
Ramon Llull (1232–1315) wrote a Liber Chaos, in which he identifies Chaos as the primal form or matter created by God. Swiss alchemist Paracelsus (1493–1541) uses chaos synonymously with "classical element" (because the primeval chaos is imagined as a formless congestion of all elements). Paracelsus thus identifies Earth as "the chaos of the gnomi", i.e., the element of the gnomes, through which these spirits move unobstructed as fish do through water, or birds through air. An alchemical treatise by Heinrich Khunrath, printed in Frankfurt in 1708, was entitled Chaos. The 1708 introduction to the treatise states that the treatise was written in 1597 in Magdeburg, in the author's 23rd year of practicing alchemy. The treatise purports to quote Paracelsus on the point that "The light of the soul, by the will of the Triune God, made all earthly things appear from the primal Chaos." Martin Ruland the Younger, in his 1612 Lexicon Alchemiae, states, "A crude mixture of matter or another name for Materia Prima is Chaos, as it is in the Beginning."
The term gas in chemistry was coined by Dutch chemist Jan Baptist van Helmont in the 17th century directly based on the Paracelsian notion of chaos. The g in gas is due to the Dutch pronunciation of this letter as a spirant, also employed to pronounce Greek χ.
The term chaos has been adopted in modern comparative mythology and religious studies as referring to the primordial state before creation, strictly combining two separate notions of primordial waters or a primordial darkness from which a new order emerges and a primordial state as a merging of opposites, such as heaven and earth, which must be separated by a creator deity in an act of cosmogony. In both cases, chaos referring to a notion of a primordial state contains the cosmos in potentia but needs to be formed by a demiurge before the world can begin its existence.
Use of chaos in the derived sense of "complete disorder or confusion" first appears in Elizabethan Early Modern English, originally implying satirical exaggeration. "Chaos" in the well-defined sense of chaotic complex system is in turn derived from this usage.
- Euripides Fr.484, Diodorus DK68,B5,1, Apollonius Rhodius I,49 Kirk p.42
- Kirk, Raven & Schofield 2003, p. 42
- Kirk, Raven & Schofield 2003, p. 44
- Hesiod, Theogony 116–122.
- Hesiod, Theogony 123–124.
- West, p. 192 line 116 Χάος, "best translated Chasm"; English chasm is a loan from Greek χάσμα, which is root-cognate with χάος. Most, p. 13, translates Χάος as "Chasm", and notes: (n. 7): "Usually translated as 'Chaos'; but that suggests to us, misleadingly, a jumble of disordered matter, whereas Hesiod's term indicates instead a gap or opening".
- R. S. P. Beekes, Etymological Dictionary of Greek, Brill, 2009, pp. 1614 and 1616–7.
- "chaos". Online Etymology Dictionary.
- Lidell-Scott, A Greek–English Lexiconchaos
- Kirk, Raven & Schofield 2003, p. 57
- Richard F. Moorton, Jr. (2001). "Hesiod as Precursor to the Presocratic Philosophers: A Voeglinian View". Archived from the original on 2008-12-11. Retrieved 2008-12-04.
- Gantz, p. 3, says "the Greek will allow both".
- According to Gantz, p. 4: "With regard to all three of these figures—Gaia, Tartaros, and Eros—we should note that Hesiod does not say they arose from (as opposed to after) Chaos, although this is often assumed." For example, Morford, p. 57, makes these three descendants of Chaos saying they came "presumably out of Chaos, just as Hesiod actually states that 'from Chaos' came Erebus and dark Night". Tripp, p. 159, says simply that Gaia, Tartarus and Eros came "out of Chaos, or together with it". Caldwell, p. 33 n. 116–122, however interprets Hesiod as saying that Chaos, Gaia, Tartarus, and Eros all "are spontaneously generated without source or cause". Later writers commonly make Eros the son of Aphrodite and Ares, though several other parentages are also given, Gantz, pp. 4–5.
- Gantz, p. 4; Hesiod, Theogony 123.
- Hesiod, Theogony 814: "And beyond, away from all the gods, live the Titans, beyond gloomy Chaos".
- Hesiod, Theogony 700.
- Gantz, p. 3; Hesiod, Theogony 813–814, 700; cf. 740.
- William Keith Chambers Guthrie (2000). A History of Greek Philosophy. Cambridge University Press. ISBN 9780521294201. Archived from the original on 2014-01-03. pp. 59, 60, 83 ISBN 0-521-29420-7
- W. Jaeger (1953). The Theology of the early Greek philosophers. The Gifford lectures p.33:Nilsson, Vol I, p.743
- W. K. Guthrie (1952): The Presocratic World-picture p.87: Nilsson, Vol I, p.743
- Kirk, Raven & Schofield 2003, pp. 9, 10, 20
- Hesiod Theogony 740-765: 
- Aristophanes, Birds 693–699; Morford, pp 57–58. Caldwell, p. 2, describes this avian theogony as "comedic parody".
- Ovid, Metamorphoses 1.5 ff.. : Ante mare et terras et quod tegit omnia caelum
- unus erat toto naturae vultus in orbe,
- quem dixere chaos: rudis indigestaque moles
- nec quicquam nisi pondus iners congestaque eodem
- non bene iunctarum discordia semina rerum.
- Hyginus, Fabulae Preface 1, translated by Smith and Trzaskoma, p. 95. According to Bremmer, p. 5, who translates Caligine as "Darkness": "Hyginus ... started his Fabulae with a strange hodgepodge of Greek and Roman cosmogonies and early genealogies. It begins as follows: Ex Caligine Chaos. Ex Chao et Caligine Nox Dies Erebus Aether (Praefatio 1). His genealogy looks like a derivation from Hesiod, but it starts with the un-Hesiodic and un-Roman Caligo, ‘Darkness’. Darkness probably did occur in a cosmogonic poem of Alcman, but it seems only fair to say that it was not prominent in Greek cosmogonies."
- Ogden, pp. 36–37.
- Wyatt, Nicolas (2001-12-01). Space and Time in the Religious Life of the Near East. A&C Black. pp. 210–211. ISBN 9780567049421.
- Watkins, Calvert (1995). How to Kill a Dragon. London: Oxford University Press. ISBN 978-0-19-514413-0
- Tsumura, D., Creation and Destruction. A Reappraisal of the Chaoskampf Theory in the Old Testament, Winona Lake/IN, 1989, 2nd ed. 2005, ISBN 978-1-57506-106-1.
- C. Westermann, Genesis, Kapitel 1-11, (BKAT I/1), Neukirchen-Vluyn, 1974, 3rd ed. 1983.
- Genesis 1:2, English translation (New International Version)(2011): BibleGateway.com Biblica incorporation
- Strong's Concordance H1516.
- Gerhard May, Schöpfung aus dem Nichts. Die Entstehung der Lehre von der creatio ex nihilo, AKG 48, Berlin / New York, 1978, 151f.
- H. Gunkel, Genesis, HKAT I.1, Göttingen, 1910.
- Michaela Bauks, Chaos / Chaoskampf, WiBiLex – Das Bibellexikon (2006).
- Michaela Bauks, Die Welt am Anfang. Zum Verhältnis von Vorwelt und Weltentstehung in Gen 1 und in der altorientalischen Literatur (WMANT 74), Neukirchen-Vluyn, 1997.
- Michaela Bauks, ''Chaos' als Metapher für die Gefährdung der Weltordnung', in: B. Janowski / B. Ego, Das biblische Weltbild und seine altorientalischen Kontexte (FAT 32), Tübingen, 2001, 431-464.
- De Nymphis etc. Wks. 1658 II. 391
- Khunrath, Heinrich (1708). Vom Hylealischen, das ist Pri-materialischen Catholischen oder Allgemeinen Natürlichen Chaos der naturgemässen Alchymiae und Alchymisten: Confessio.
- Urszula Szulakowska, The alchemy of light: geometry and optics in late Renaissance alchemical illustration, vol. 10 of Symbola et Emblemata - Studies in Renaissance and Baroque Symbolism, BRILL, 2000, ISBN 978-90-04-11690-0, ch. 7 (pp. 79ff).
- Szulakowska (2000), p. 91, quoting Chaos p. 68.
- "halitum illum Gas vocavi, non longe a Chao veterum secretum." Ortus Medicinæ, ed. 1652, p. 59a, cited after the Oxford English Dictionary.
- Mircea Eliade, article "Chaos" in Religion in Geschichte und Gegenwart, 3rd ed. vol. 1, Tübingen, 1957, 1640f.
- Stephen Gosson, The schoole of abuse, containing a plesaunt inuectiue against poets, pipers, plaiers, iesters and such like caterpillers of a commonwelth (1579), p. 53 (cited after OED): "They make their volumes no better than [...] a huge Chaos of foule disorder."
- Bremmer, Jan N. (2008). Greek Religion and Culture, the Bible and the Ancient Near East. Jerusalem Studies in Religion and Culture. Brill. ISBN 9789004164734. LCCN 2008005742.
- Clifford, Richard J, "Creation and Destruction: A Reappraisal of the Chaoskampf Theory in the Old Testament", Catholic Biblical Quarterly, 2007.
- Day, John, God's conflict with the dragon and the sea: echoes of a Canaanite myth in the Old Testament, Cambridge Oriental Publications, 1985, ISBN 978-0-521-25600-1.
- Gantz, Early Greek Myth: A Guide to Literary and Artistic Sources, Johns Hopkins University Press, 1996, Two volumes: ISBN 978-0801853609 (Vol. 1), ISBN 978-0801853623 (Vol. 2).
- G. S. Kirk; J. E. Raven; M. Schofield (2003). The Presocratic philosophers. Cambridge University Press. ISBN 0-521-27455-9.
- Ogden, Daniel, Dragons, Serpents, and Slayers in the Classical and early Christian Worlds: A sourcebook, Oxford University Press. ISBN 978-0-19-992509-4.
- Smith, William; Dictionary of Greek and Roman Biography and Mythology, London (1873). "Chaos"
- Wyatt, Nick, Arms and the King: The Earliest Allusions to the Chaoskampf Motif and their Implications for the Interpretation of the Ugaritic and Biblical Traditions (1998), republished in There's such divinity doth hedge a king: selected essays of Nicolas Wyatt on royal ideology in Ugaritic and Old Testament literature, Society for Old Testament Study monographs, Ashgate Publishing, 2005, ISBN 978-0-7546-5330-1, 151-190.