1. A Phocian. who, on the death of Phayllus, B. C. 353, was appointed guardian to the young Phalaecus, the son of Onomarchus, and the successor of Phayllus in the supreme command of the Phocians in the Sacred War. Mnaseas was soon after slain in a nightbattle with the Thebans.
He was perhaps the same person whose private quarrel with one Euthycrates about an heiress had, according to Aristotle, given occasion to the war. (Diod. 16.38
; comp. Paus. 10.2
; Arist. Polit.
5.4, ed. Bekk.)