(), a son of Onchestus, is also called a son of
Poseidon by Oenope, of Hippomenes, Apollo, or Aegeus. (Apollod. 3.15.8; Paus. 1.39.5; Ov. Met. 10.605; Hyg. Fab. 157;
Steph. Byz. s. v.Μέγαρα.) He was a brother of Abrote, the wife of Nisus,
and the father of Euippus, Timalcus, and Euaechme, to whom Ovid adds a fourth, Hippomenes.
(Paus. 1.41.4; Plut. Quaest. Graec. 16.)
According to a Boeotian tradition, Megareus with his army went to the assistance of Nisus,
king of Megara, against Minos ; but he fell in battle, and was buried at Megara, which was
called after him, for its previous name had been Nisa. (Apollod. l.c.;
Paus. 1.39.5, 42.1.) According to
a Megarian tradition, which discarded the account of an expedition of Minos against Megara,
Megareus was the husband of Iphinoe, the daughter of Nisus, and succeeded his father-in-law in
the government of Megara, which he left to Alcathous, because his own two sons had died before
him. (Paus. 1.39.5; comp. ALCATHOUS.)