The first Catholic King of England after the Reformation was King James II. He ascended the throne in 1685 and was known for his attempts to promote religious tolerance and Catholicism during a time when Protestantism was the dominant faith in England. His reign faced significant opposition, leading to the Glorious Revolution in 1688, which resulted in his abdication. Following James II’s departure, Protestant rulers William and Mary were invited to take the throne, solidifying Protestantism's hold on the British monarchy and leading to significant political and religious changes in England.