τριττυάρχης

A. chief of a τριττύς 111, IG 22.641.31 (iii B. C.), Poll. 8.109; = tribunus, D.H. 2.7; of an officer in the army, Lib. Or. 25.58; τριττυάρχης, EM 768.13.
Liddell, Scott & Jones
A Greek-English Lexicon, 1940
An open-access project