Who married Harry Powlett, 4th Duke of Cleveland?
Wilhelmina Powlett, Duchess of Cleveland married Harry Powlett, 4th Duke of Cleveland on . Harry Powlett, 4th Duke of Cleveland was 51 years old on the wedding day (51 years, 3 months and 14 days). Wilhelmina Powlett, Duchess of Cleveland was 35 years old on the wedding day (35 years, 2 months and 1 days). The age gap was 16 years, 1 months and 13 days.
The marriage lasted 37 years, 0 months and 19 days (13533 days ). The marriage ended on . Cause: death of subject's spouse
Harry Powlett, 4th Duke of Cleveland

Harry George Powlett, 4th Duke of Cleveland (19 April 1803 – 21 August 1891), styled The Honourable Harry Vane until 1827 and Lord Harry Vane from 1827 to 1864, who in 1864 adopted by Royal Licence the surname and arms of Powlett in lieu of Vane, was an English landowner, diplomat and Whig statesman. During the crisis which led to the collapse of Lord Russell's government in 1866 over the question of parliamentary reform, he was considered a possible compromise prime minister in a Whig-Conservative anti-reform coalition government, but such plans came to nothing.
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Wilhelmina Powlett, Duchess of Cleveland

Catherine Lucy Wilhelmina Powlett, Duchess of Cleveland (née Stanhope; 1 June 1819 – 18 May 1901), also known as Lady Dalmeny and Lady Harry Vane, was an English courtier, historian and genealogist, best known for her 1889 work The Battle Abbey Roll with some Account of the Norman Lineages.
By her first marriage to Lord Dalmeny, she was the mother of Prime Minister Archibald Primrose, 5th Earl of Rosebery.
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