Thoas, son of Dionysus and Ariadne, is king of Lemnos when the Lemnian women massacre the island's men. His daughter Hypsipyle alone spares him — hiding him, setting him adrift in a chest or boat, or (in Apollodorus) failing later when the women discover the escape and kill him. By Hypsipyle and Jason he becomes grandfather of Euneus. Some later authors identify him with the Taurian king; the atlas keeps thoas-lemnos and thoas-tauris as separate nodes.
Adapted from Wikipedia, "Thoas (king of Lemnos)" · CC BY-SA 4.0
I.Family
Apollodorus has Dionysus carry Ariadne to Lemnos and father Thoas, Staphylus, Oenopion, and Peparethus; Plutarch notes forks that give Oenopion and Staphylus to Theseus instead. Thoas is father of Hypsipyle; through her and Jason he is grandfather of Euneus (and, in some plays, of a second son also named Thoas, or Nebrophonus / Deipylus). After escaping Lemnos he fathers Sicinus by the nymph Oenoe, eponym of the island Sikinos. Some give him a wife Myrina, daughter of Cretheus. Diodorus makes him a general of Rhadamanthus who received Lemnos as a grant.
II.The Lemnian crime
When the women of Lemnos killed all the men, Hypsipyle saved her aged father. Apollonius has her put him in a hollow chest and cast him on the sea; fishermen land him on Oenoe (later Sicinus). Valerius Flaccus elaborates a night rescue through Dionysus's temple, a cult-statue disguise, and a boat that reaches the Taurians — the strand that merges him with the Taurian king. Statius hides him on a ship; Hyginus's storm drives him to "island Taurica." Apollodorus instead has the women later discover the escape, kill Thoas, and sell Hypsipyle into slavery.
Herodotus already treats the slaughter of "Thoas's companions" as the proverbial "Lemnian crime." In the Iliad a silver bowl that once belonged to Thoas becomes a funeral prize via Euneus and Patroclus. Homonym care: distinct from thoas-tauris unless a source explicitly identifies them.