In Greek mythology, Idyia () or Eidyia (; ) was a daughter of the Titans Oceanus and Tethys,Hesiod, Theogony 352 and queen to Aeëtes, king of Colchis.Apollonius Rhodius, 3.241–244, 269 with scholia ad 3.242 as cited from Hesiod She was the mother of Medea, Chalciope and Absyrtus.Hesiod, Theogony 960; Apollodorus, 1.9.23; Hyginus, Fabulae 25Accounts vary on the name of Absyrtus' mother, and only Apollodorus (1.9.23) seems to consider him full brother of Medea; see Absyrtus. According to Apollonius of Rhodes, she was the youngest of the Oceanides.Apollonius Rhodius, 3.243–244 Her name means "the fair-faced" or "the knowing one" derived from the Greek word () meaning "to see" or "to know".
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References Apollodorus, The Library with an English Translation by Sir James George Frazer, F.B.A., F.R.S. in 2 Volumes, Cambridge, MA, Harvard University Press; London, William Heinemann Ltd. 1921. ISBN 0-674-99135-4. Online version at the Perseus Digital Library. Greek text available from the same website. Apollonius Rhodius, Argonautica translated by Robert Cooper Seaton (1853–1915), R. C. Loeb Classical Library Volume 001. London, William Heinemann Ltd, 1912. Online version at the Topos Text Project. Internet Archive. Apollonius Rhodius, Argonautica. George W. Mooney. London. Longmans, Green. 1912. Greek text available at the Perseus Digital Library. Gaius Julius Hyginus, Fabulae from The Myths of Hyginus translated and edited by Mary Grant. University of Kansas Publications in Humanistic Studies. 1960. Online version at the Topos Text Project. Hesiod, Theogony from The Homeric Hymns and Homerica with an English Translation by Hugh G. Evelyn-White, Cambridge, MA., Harvard University Press; London, William Heinemann Ltd. 1914. Online version at the Perseus Digital Library. Greek text available from the same website.