εὐθηνιάρχης
From LSJ
αὐτὸν κέκρουκας τὸν βατῆρα τοῦ λόγου → you have struck the very threshold of the argument, you have struck the most important and chiefmost point
English (LSJ)
ον, ὁ,
A commissioner of food- (esp. corn-) supply, BGU556ii12, POxy.1412.1 (both iii A.D.):—hence εὐθηνιαρχ-έω, ib.908.19 (ii A.D.), 2108.3 (iii A.D.), BCH12.84 (Zeus Panamaros).