Wiktionary
cardinalist
n. A partisan of cardinals http://en.wikipedia.org/wiki/Armand%20Jean%20du%20Plessis,%20Cardinal%20Richelieu and http://en.wikipedia.org/wiki/Jules%20Cardinal%20Mazarin in 17th century France (as opposed to a royalist).
Usage examples of "cardinalist".
In addition to that, my own power in the province is known, whilst my defection from the Cardinalist party is feared.
Comte de Montforge, evidently a Cardinalist agent, loses a handkerchief which bears the initials of this same lady.