Leading

The genitive is used with verbs signifying to rule, command, lead.

θεῖον τὸ ἐθελόντων ἄρχειν it is divine to rule over willing subjects X. O. 21.12, τῆς θαλάττης ἐκράτει he was master of the sea P. Menex. 239e, Ἔρως τῶν θεῶν βασιλεύει Love is king of the gods P. S. 195c, ἡγεῖτο τῆς ἐξόδου he led the expedition T. 2.10, στρατηγεῖν τῶν ξένων to be general of the mercenaries X. A. 2. 6. 28. So with τυραννεῖν be absolute master of, ἀνἀσσειν be lord of (poet.), ἡγεμονεύειν be commander of. This genitive is connected with that of 1402.