Which preposition to use with khalifas

in Occurrences 1%

If one glorify the other three Khalifas in a Sunni quarter, it is well with one, but not so in an area devoted to the Shia population: and so the beggar chooses Ali's name as a convenient and fitting means of opening the purse-strings of both the great Musulman sects.

Which preposition to use with  khalifas