ἀρχισύμμαχος

From LSJ

οὐ γὰρ πράξιν ἀγαθὴν, ἀλλὰ καὶ εὖ ποεῖν αὐτὴν → it does not suffice to do good–one must do it well

Source

Spanish (DGE)

-ου, ὁ encargado de correos, jefe de mensajeros, PKlein Form.314.2 (V/VI d.C.), 271.3, PLaur.93.4 (ambos VI d.C.).