chiliarch

Borrowed from Ancient Greek χιλίαρχος (khilíarkhos) via Latin chiliarchus.

chiliarch (plural chiliarchs)

1. (historical) A commander of a thousand troops in Hellenistic Greece.
   • 1886, Anna Swanwick (translator), The Dramas of Aeschylus, 4th edition, The Persians, page 220, lines 306–307

     And Dadaces, the chiliarch, spear-struck,
     Forth from his galley leapt with nimble bound.

   • 1982, Gene Wolfe, chapter XXIV, in The Sword of the Lictor (The Book of the New Sun; 3), New York: Timescape, →ISBN, page 179:

     When I had seen it, I halted and turned to look up at the peak on whose slope we walked. I could see the face now and its mitre of ice, and below it the left shoulder, where a thousand cavalrymen might have been exercised by their chiliarch.