In 1660, after the death of Oliver Cromwell and the collapse of the Commonwealth, Charles II was invited back to London and restored to his father's throne, marking the Restoration of the monarchy in England, Scotland, and Ireland. The Declaration of Breda laid out the terms of restoration, and Charles II pledged to uphold the Anglican Church while allowing religious toleration. On May 14, 1660, Charles II was formally restored to his kingdoms and proclaimed King of Great Britain and Ireland. The years of his reign are known in English history as the Restoration period.
During Charles II's reign, there were significant political and social changes in England. Puritanical Protestants still had great sway in England and even more so in Scotland, while the King was personally close to many Catholics and their sympathizers. The final phase of his reign was taken up mainly with attempts to settle religious dissension. Charles II had no legitimate children, and he was well known for his numerous mistresses. Despite his personal failings, Charles II's political adaptability and knowledge of men enabled him to remain on the throne until his death in 1685.