πεντηκόνταρχος

English (LSJ)

ὁ, at Athens,

   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.