Hesiod's Theogony is a large-scale synthesis of a vast variety of local Greek traditions concerning the gods, organized as a narrative that tells how they came to be and how they established permanent control over the cosmos. It is the first Greek mythical cosmogony. The initial state of the universe is chaos, a dark indefinite void considered as a divine primordial condition from which everything else appeared.
Theogony is a part of Greek mythology which embodies the desire to articulate reality as a whole; this universalizing impulse was fundamental for the first later projects of speculative theorizing.