According to Hesiod's Theogonia (The origin of the Gods), Chaos was the nothingness out of which the first objects of existence appeared. These first beings, described as children of Chaos alone, were Gaia (the Earth), Tartarus (the Underworld), Nyx (the darkness of the night), Erebus (the darkness of the Underworld), and Eros (sexual love). From these beings and the first generation of beings created by them, Hesiod establishes the deities related to each element known to early Greeks, beginning with the primordial elements: the Earth, the bright Sky (Ouranos), and the Sea (Pontus