In Greek mythology, Theia (also written Thea or Thia), also called Euryphaessa ("wide-shining"), was a Titan. With her brother and husband Hyperion, she was the mother of Helios (the Sun), Selene (the Moon) and Eos (the Dawn). The name Theia alone, means simply "goddess," Theia Euryphaessa with overtones of brightness.
"Mother of the Sun, Theia of many names, for your sake men honor gold as more powerful than anything else; and through the value you bestow on them, o queen, ships contending on the sea and yoked teams of horses in swift-whirling contests become marvels".
She seems here a goddess of glittering in particular and of glory in general, but Pindar's allusion to her as "Theia of many names" is telling, since it suggests assimilation not only to similar mother-of-the-sun goddess like Phoebe and Leto, but perhaps also to more universalizing mother-figures like Rhea and Cybele.
HYPERION was the Titan god of light, one of the sons of Ouranos (Heaven) and Gaia (Earth), and the father of the lights of heaven--Eos the Dawn, Helios the Sun, and Selene the Moon.
His wife was Theia, lady of the aither--the shining blue of the sky.
HYPERI′ON (Huperiôn), a Titan, a son of Uranus and Ge, and married to his sister Theia, or Euryphaessa, by whom he became the father of Helios, Selene, and Eos.