Which preposition to use with unify

in Occurrences 3%

It was directed by a central oligarchy and patrolled, defended and extended by a military force unified in theory but in practice grouped around the outstanding personalities and subjected to the vagaries and upsets always associated with power politics in the hands of military backed political despots.

on Occurrences 1%

Philosophy ought to get the manifolds of experience unified on principles less empty.

Which preposition to use with  unify