A royalist is someone who supports their country's royal family or who believes that their country should have a king or queen. He was hated by the royalists. = monarchist republican. someone who supports their country's king or queen, or believes that a country should be ruled by kings or queens republican
Can carry the connotation of a legitimist, a supporter of a particular royal line, especially one in danger of being dispossessed of a throne or actually dispossessed of such, and claiming to have the better claim to the throne on the basis of line of descent