The Hesiodic Creation (Cosmogony)
In the Theogony, the first thing is Chaos, from which come Gaia (Earth), Tartarus, Eros, and Nyx. Gaia bears Ouranos (Sky), and the union of Gaia and Ouranos produces the Titans, the Cyclopes, and the Hecatoncheires [S1]S1 · Hesiod, Theogonyc. 700 BCEtextOpen source ↗.
Ancient Greek religion is a historical religion. Its myths are attested in primary literary and material sources; disagreements between authors (Hesiod vs. Orphic vs. local cults) are preserved as variants, not resolved.
The Orphic cosmogony (egg, Phanes) is a genuine alternative to the Hesiodic account; both are preserved [S1]S1 · Hesiod, Theogonyc. 700 BCEtextOpen source ↗[S5]S5 · Pseudo-Apollodorus, Library (Bibliotheca)c. 1st–2nd c. CE (transmits earlier)text.
Chaos First
Gaia and the First Beings
Ouranos and the Titans
Variants of this story (2)
A cosmic egg and the god Phanes; a different, later cosmogony [S5]S5 · Pseudo-Apollodorus, Library (Bibliotheca)c. 1st–2nd c. CE (transmits earlier)text.