πρωτοστάτης

Etymology
From +.

Noun

 * 1) one who stands first, especially the first man on the right of the line; right-hand man
 * 2)  the front-rank men
 * 3) the lochagos
 * 4) man in the uneven rows in a lochos, as opposed to the epistates
 * 5)  the chief or leader of a party

Etymology
From.

Noun

 * 1) ringleader, prime mover