δυνάστης
From LSJ
βωμὸν Ἀριστοτέλης ἱδρύσατο τόνδε Πλάτωνος, ἀνδρὸς ὃν οὐδ' αἰνεῖν τοῖσι κακοῖσι θέμις → Aristotle had this altar of Plato set up — Plato, a man whom the wicked dare not even mention in praise
English (LSJ)
ου, ὁ,
A lord, master, ruler, of Zeus, S.Ant.608 (lyr.); ἄνδρες δ. the chief men in a state, Hdt.2.32, cf. Pl.R.473d, etc.; petty chief, princelet, Th.7.33, etc.; ἡγεμόσι καὶ δ. καὶ βασιλεῦσιν Plb.9.23.5, cf. 10.34.2, Posidon.50 J., Str. 17.3.25; λαμπροὶ δυνάσται, of the stars, A.Ag.6.