χῑλίαρχ-ος · chiliarch-os — LSJ
captain over a thousand, A. Pers. 304: esp. commandant of a garrison, X. Cyr. 8.1.14, Oec. 4.7.
= χιλιάρχης II, Plb. 6.19.1, al., D.H. 2.14, Inscr.Magn. 157b (i A. D.), etc. (the usual form in this sense).
title of Persian court official, Plu. Art. 5, Ael. VH 1.21; also in Macedonia, D.S. 18.48.