The most popular of Charles II's children was James Scott. Charles gave him the title Duke of Monmouth. James's mother had been Charles's girlfriend when he was living in Holland, and some people said that they had been secretly married. If this had been true, then James would have been allowed to be king when Charles died. There were many who wanted this to happen, because they did not like the thought of Charles's younger brother being the next king. This brother, who was also called James, was a Roman Catholic and was not popular.