In Greek mythology, Thasus (pronounced: /ˈθeɪsəs/ or /ˈθeɪzəs/) was a son of Poseidon (or, in other versions, Cilix or Agenor). In the stories, he was one of those who set out from Phoenicia in search of Europa, and "founded" the eponymous town of Thasos on the island of the same name.