Which preposition to use with libyans

in Occurrences 1%

He apparently meditated an expedition against the free Libyans in the west.

on Occurrences 1%

To insure the fidelity of the latter the general, who knew the men with whom he had to deal, gave them as a proof of his confidence a general leave of absence for the whole winter; while, not sharing the narrow-minded exclusiveness of Phoenician patriotism, he promised to the Libyans on his oath the citizenship of Carthage, should they return to Africa victorious.

Which preposition to use with  libyans