Charles II was king of England, Scotland and Ireland. He was king of Scotland from 1649 until his deposition in 1651, and king of England, Scotland and Ireland from the restoration of the monarchy in 1660 until his death.
King Charles II: Bio Facts
Prince William: 'I don't lie awake waiting to be king' BBC News
King Charles II of England dissolves Parliament
Charles II and the English Restoration (The Stuarts: Part Three)