Which preposition to use with cluniacs

in Occurrences 1%

The Cluniacs in France and the congregations of Italy all hailed his elevation as the beginning of a better time, and side by side with this simonist Pope a young and brave monk suddenly appears, who, after the heroic exertions of a lifetime, was to raise the degenerate papacy to a height hitherto undreamed of.

Which preposition to use with  cluniacs