"In Greek mythology, Thoas (Ancient Greek: Θόας, "fleet, swift") was a king of the Taurians, a barbaric tribe in the Crimea. He was king when Agamemnon's daughter Iphigenia was taken to the land of the Taurians, and became a priestess of Artemis there. He was a character in Euripides' play Iphigenia among the Taurians. He is sometimes identified with the Thoas who was the king of Lemnos and the son of Dionysus and Ariadne, and the father of Hypsipyle.
According to the Greek grammarian Antoninus Liberalis, the 2nd-century BC poet Nicander said that Thoas was the son of Borysthenes, god of a major river to the far north of Greece (now the Dnieper)." - (en.wikipedia.org 28.05.2022)
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