(Φθίος).
1. A son of Poseidon by Larissa, from whom Phthia in Thessaly was said to have derived its name. (Eustath. ad Hom. p. 320; Dionys. A. R. 1.17.)
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