Primordial deity

A god who exists before the generations of gods begin — in Hesiod the four who simply "came to be" (Chaos, Earth, Tartarus, Eros) and the children of Chaos and Night (Erebus, Night, Aether, Day), who have no father. The modern term groups them against the Titans and Olympians, who are born of parents; the Norse Ymir and the Egyptian watery Nu play the same part in their own texts.