In Greek mythology, Caeneus or Kaineus (/ˈsɛnjuːs/ SEN-yooss; Ancient Greek: Καινεύς, romanized: Kaineús) was born a girl, Caenis (/ˈsiːnɪs/; Ancient Greek: Καινίς, romanized: Kainís) the daughter of Elatus, who was raped by Poseidon and transformed by him into an invulnerable man. He was a Lapith ruler of Thessaly, and the father of the Argonaut Coronus. He participated in the Centauromachy where he met his demise at the hands of the Centaurs by being pounded into the ground while still alive.[2]