A monarchist (supporter of monarchy) or supporter of a particular royal régime. / (historical) a Cavalier, a supporter of King Charles I of England during the English Civil War.

of or pertaining to royalism or royalists

plural of royalist

plural of Port-Royalist

(historical) One of the dwellers in the Cistercian convent of Port-Royal-des-Champs, near Paris, France, when it was the home of the Jansenists in the 17th century, among them being Arnauld, Pascal, and other famous scholars.