Clarence House has been the official residence of the heir apparent of who?
Charles, Prince of Wales Charles, Prince of Wales (Charles Philip Arthur George; born 14 November 1948) is the eldest child and heir apparent of Queen Elizabeth II. Known alternatively in Cornwall as Duke of Cornwall and in Scotland as Duke of Rothesay, he is the longest-serving heir apparent in British history, having held the position since 1952. He is also the oldest person to be next in line to the throne since Sophia of Hanover (the heir presumptive to Queen Anne), who died in 1714 at the age of 83.
Marlborough House Marlborough House, a Grade I listed mansion in St James's (City of Westminster, Inner London), is the headquarters of the Commonwealth of Nations and the seat of the Commonwealth Secretariat. It was built for Sarah Churchill, Duchess of Marlborough, the favourite and confidante of Queen Anne. For over a century it served as the London residence of the Dukes of Marlborough.