Roundheads = Puritans, Cavaliers = ???

I am having a little trouble finding whether or not the Cavaliers were Catholics. It would make sense to me that if the Roundheads were Puritan and the civil war that took place during this time period was between the Puritans and the Catholics then the Cavaliers should be Catholics. It would just make me feel better if someone specifically told me that the Cavaliers were Catholics or if they pointed out a section in the book were I could find the answer.