Which preposition to use with dominators

in Occurrences 1%

Peoples accustomed to be dominated and to serve have come to believe that, having become dominators in their turn, they have the right to use every kind of violence against their overlords of yesterday.

of Occurrences 1%

He was accustomed to find them either as dominators of all the seas, or else solidly installed on all the strategic and commercial coasts.

Which preposition to use with  dominators