"Charles II (29 May 1630 – 6 February 1685) was the King of England, King of Scots, and King of Ireland from 30 January 1649 (de jure) or 29 May 1660 (de facto) until his death. His father Charles I had been executed in 1649. Following the English Civil War; the monarchy was then abolished and England, and subsequently Scotland and Ireland became a united republic under Oliver Cromwell, the Lord Protector, albeit with Scotland and Ireland under military occupation and de facto martial law. In 1660, shortly after Cromwell's death, the monarchy was restored under Charles II. He was popularly known as the 'Merry Monarch' in reference to his cheerful disposition."
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Is there anything better than a royal biography written by the royalty of English biography writing Lady Antonia Fraser?
Royal Charles: Charles II and the Restoration,