πεντηκόνταρχος

A. commander of fifty men, serving under the τριήραρχος, X. Ath. 1.2, D. 50.18, 19, 24 (wrongly expld. by Harp. as commander of a πεντηκόντερος).

2. generally, leader of a company of fifty, LXX Ex. 18.21, 4 Ki. 1.9.