 He was the son of Poseidon and Alope, Cercyon's daughter.Although Cercyon had her buried alive, Poseidon turned her into the spring, Alope, near Eleusis.Hippothoon was stated to be present in the missions of Triptolemus and was mentioned along with Eumolpus as an Eleusinian hero who was worshiped according to honorary decrees dating to the 4th century BC.