(Δίκαιος), a son of Poseidon, from whom Dicaea, a town in Thrace, is said to have derived its name. (Steph. Byz. s. v. Δίκαια.)
[L.S]A Dictionary of Greek and Roman biography and mythology
Smith, William
A Dictionary of Greek and Roman biography and mythology. William Smith, LLD, ed. 1890