Theia

In Greek mythology, Theia (also written Thea or Thia), also called Euryphaessa ("wide-shining"), was a Titaness. The name Theia alone means simply "goddess"; Theia Euryphaessa brings overtones of extent (eury-) and brightness. With her brother and husband Hyperion, "mild-eyed Euryphaessa, the far-shining one" (Homeric Hymn to Helios) was the mother of Helios (the Sun), Selene (the Moon) and Eos (the Dawn).
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Noun
1. (Greek mythology) the Titaness who was mother of Helios and Selene and Eos in ancient mythology
(synonym) Thea
(hypernym) Titaness
(classification) Greek mythology

[Greek] Theia is a minor Greek goddess, one of the Titans. Her husband and brother is Hyperion with whom she had three children - Helios (the sun), Eos (the dawn) and Selene (the moon).