The Theogony is a poem by Hesiod describing the origins of the Gods of Greece composed around 700 BC.
Description
The Theogony is a large synthesis of the wider local Greek traditions concerning the Gods origins, organized as a narrative.
It if often used as a sourcebook for Greek Mythology, however in formal terms it is a hymn invoking Zeus and the Muses.
Story
Note:This is a brief summary
The poem starts with a blessing from the Muses and thanks them for inspiration
Cosmogony and Castration of Ouranus
Chaos was the first to come to be, followed by Gaia, Tartaros and Eros. From Chaos came forth Erebos and Nyx, and from Night and Erebos came Aither and Hemera. From Earth came Ouranus, The Ourea and Pontos.
Gaia then lay with Ouranus and bore Oceanos, Koios, Krios, Hyperion, Iapetos, Theia, Rhea, Themis, Mnemosyne, Phoebe and Tethys. After them Kronos was born. After that she mated with Ouranus once again, and bare the Kyklopes; Brontes, Steropes and Arges, who made thunder for Zeus. She also had the Hekatonchires; Kottos, Briareos, and Gyges. Ouranus was disgusted with them and hide them away in Gaia. She asked the Titans to punish their father, and Kronos volunteered, and castrated him with the sickle his mother gave him. From the drops of blood which fell on Earth, the Erinyes and the Gigantes, the Nymphs Meliai all around Earth. From the sea foam came Aphrodite, and with her came Eros and Himeros.
Spirits of Night
Nyx bare hateful Moros (Doom) and Ker (Fate) and Thanatos (Death), and Hypnos (Sleep) and the tribe of Oneiroi (Dreams). And she lay with none, bare Momos (Criticism) and Oizys (Misery), and the Hesperides. Also she bare the Moirai (Fates) and the ruthless Keres (Deaths). Also she bare Nemesis to afflict mortal men, and Apate (Deceit) and Philotes (Sex) and Geras (Old Age) and Eris (Strife)."
And Eris bore Ponos (Toil), and Lethe (Forgetfulness), and Limos (Starvation), and the Algea (Pains), the Hysminai (Fightings) and the Makhai (Battles), the Phonoi (Murders) and the Androktasiai (Man-slaughters), the Neikea (Quarrels), the Pseudo-Logoi (Lies), the Amphilogiai (Disputes), and Dysnomia (Lawlessness) and Ate (Ruin) and Horkos (Oath).
Sea Gods
Pontos and Gaia had Nereus, the old man of the sea, Thaumas and Phorkys, Keto and Eurybia. And Nereus and Doris, daughter of Okeanus, had the Nereides, who included Amphrite and Galene and the other 48 daughters.
And Thaumas married Elektra, and she bare him Iris and the Harpies, Aello and Okypetes.
Bestiary
Keto and Phorkys bare the Graiai and the Gorgons; Sthenno, Eurayle and Medusa, she was mortal, but the other two were not, she lay with Posiedon and when she was beheaded by Persues, Khrysaor and Pegasus sprang out. Pegasus went to the gods and brings Zeus thunder and lightning.
Khrysaor joined in love with Kallirrhoe, an Okeanides and begot Geryon, the three head giant was slain by Herakles in Erythea, after driving his Oxen and killing Orthros and Eurytion.