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According to Hesiod, they were the sons of Nyx (Night) and the brothers of Hypnos (Sleep), Thanatos (Death), Geras (Old Age), the Moirai, three goddesses of destiny, and other beings, all produced via parthenogenesis.
In the Metamorphoses
The Latin poet Ovid presents them not as brothers of Hypnos, but as some of his thousand sons. He mentions three/four by name: Morpheus was identified as the god of dreams, Phobetor as the god of nightmares, Icelos/Ikelos as the god of people in prophetic dreams, and Phantasos as the god of inanimate objects in Prophetic dreams. Alternately, Morpheus (who excels in presenting human images), Phobetor/Icelos (who presents images of beasts, birds and serpents), and Phantasos (who presents images of inanimate objects in prophetic dreams, such as earth, rock, water and wood).
In the Iliad & the Odyssey
In Homer's Iliad, an Oneiros is pictured as summoned by Zeus, receiving from him spoken instructions, and then going to the camp of the Achaeans and entering the tent of Agamemnon to urge him to warfare.
The Odyssey speaks of the land of dreams as past the streams of Oceanus, close to where the spirits of the dead are led (Hades). Statius pictures the Dreams as attending on slumbering Hypnos (Somnus in Latin) in a cave in that region.
In another passage of the Odyssey, dreams (not personified) are spoken of, by a double play on words, as coming through a gate of horn if true (a play on the Greek words for "horn" and "fulfil") or a gate of ivory if false (a play on the Greek words for "ivory" and "deceive"). For this image and its echoes in later literature, see Gates of horn and ivory.
- Morpheus (can take on the forms of men).
- Phobetor (can take on the forms of beasts).
- Phantasos (can take on the forms of inanimate objects).
- Smith, William. Dictionary of Greek and Roman Biography and Mythology.