ἐφήβαρχος
From LSJ
Ὀργῆς χάριν τὰ κρυπτὰ μὴ ἐκφάνῃς φίλου → Arcana amici ne per iram prodito → Geheimnisse des Freunds verrate nicht im Zorn
English (LSJ)
ὁ, (ἔφηβος, ἄρχω)
A overseer of the youth, a magistrate in several Greek cities, OGI339.42 (Sestos), IG12(2).134 (Mytilene, in form ἐφάβ-), 12(3).524 (Thera), SIG798.23 (Cyzicus), etc., cf. Arr.Epict.3.1.34, 7.19: