Since when has the husband of Diana, Princess of Wales been heir apparent?
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.
Albert Spencer, 7th Earl Spencer Albert Edward John Spencer, 7th Earl Spencer {'1': ", '2': ", '3': ", '4': "} , (23 May 1892 – 9 June 1975), styled The Honourable Albert Spencer until 1910 and as Viscount Althorp from 1910 to 1922, and known less formally as "Jack" Spencer, was a British peer. He was the paternal grandfather of Diana Spencer, who was just under 14 years old at the time of his death. Diana would go on to marry Charles, Prince of Wales, heir to the British throne, six years later.