Fitzwilliamite

There are Canningites, and Burdettites, and Fitzwilliamites, who tell us that Protestantism and Roman Catholicism absolutely mean the same thing; or, that the things, by dint of looking tenderly upon each other, have grown into perfect likenesses.

Source: wiktionary

So Perrott's Irish friends learned that the Fitzwilliamites were formulating a charge against Perrott, with O'Rouane for chief witness.

Source: wiktionary

Finally, Carey's own suffragan in Canterbury, the Bishop of Dover, Richard Llewellin, is a Fitzwilliamite and was ordained at Westcott House, the very seminary where Robert Runcie and John Habgood were once principals.

Source: wiktionary