Which preposition to use with eorum

in Occurrences 1%

Dum ergo Ogerus dictas regiones expugnatas diuideret in hijs quindecim suis cognatis, et quemlibet eorum in suo loco constitueret regem, quatenus Christiana religio in illa orbis superficie semper stabilis permaneret, tradidit isti Præsbytero Ioanni superiorem Indiam, cum 4000.

Which preposition to use with  eorum