Harry Powlett, 4th Duke of Cleveland

Harry George Powlett, 4th Duke of Cleveland KG , 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 Russells government in 1866 over the question of parliamentary reform, he was considered a possible compromise Prime Minister in a WhigConservative antireform coalition government, but such plans came to nothing.

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Source: Wikipedia