Uranus (/jʊəˈreɪnəs/ yoor-AY-nəs), sometimes written Ouranos (Ancient Greek: Οὐρανός, lit. 'sky', [oːranós]), was the primal Greek god personifying the sky and one of the Greek primordial deities. Uranus is associated with the Roman god Caelus. In Ancient Greek literature, Uranus or Father Sky was the son and husband of Gaia, the primordial Earth Mother (Mother Earth). According to Hesiod's Theogony, Uranus was conceived by Gaia alone, but other sources suggest he was born from Nyx, or Aether and Hemera. Uranus and Gaia were the parents of the first generation of Titans, and the ancestors of most of the Greek gods, but no cult addressed directly to Uranus survived into Classical times, and Uranus does not appear among the usual themes of Greek painted pottery. Elemental Earth, Sky, and Styx might be joined, however, in solemn invocation in Homeric epic.