ἀντάρχων
From LSJ
Τὸ νικᾶν αὐτὸν αὑτὸν πασῶν νικῶν πρώτη τε καὶ ἀρίστη. Τὸ δὲ ἡττᾶσθαι αὐτὸν ὑφ' ἑαυτοῦ πάντων αἴσχιστόν τε ἅμα καὶ κάκιστον. → Τo conquer yourself is the first and best victory of all, while to be conquered by yourself is of all the most shameful as well as evil
English (LSJ)
οντος, ὁ,
A vice-president, τοῦ ἀγῶνος IG22.1077, cf. ib.12 (2).35e (Mytil.); pro-magistrate, SIG785.17 (Chios), POxy.907.21 (iii A. D.); ἀ. τῶν στρατηγῶν AJA18.329 (Sardes, i B.C.).