William Pole-Tylney-Long-Wellesley, 4th Earl of Mornington As Lord Wellesley had no legitimate children, the English barony of 1797 and the marquessate became extinct on his death in 1842. He was succeeded in the other titles by his younger brother William Wellesley-Pole, 1st Baron Maryborough , who became the third Earl of Mornington.
Duke of Wellington is a title in the Peerage of the United Kingdom.The name derived from Wellington in Somerset. The title was created in 1814 for Arthur Wellesley, 1st Marquess of Wellington (1769–1852; born as The Hon. Arthur Wesley), the Anglo-Irish military commander who is best known for leading the decisive victory with Field Marshal von Blücher over Napoleon's forces at Waterloo in ...
William Pole-Tylney-Long-Wellesley, c. 1812. In 1812 Catherine took the disastrous step of accepting the marriage proposal from the later-notorious rake, William Wellesley-Pole , nephew of two famous uncles, Richard Wellesley, 2nd Earl of Mornington, eldest brother of his father William, and Arthur Wellesley, Duke of Wellington from 1813, his father's younger brother.
In 1863 Wellington inherited the earldom of Mornington on the death of his cousin William Pole-Tylney-Long-Wellesley, 5th Earl of Mornington. From 1868 to 1884 he was Lord-Lieutenant of Middlesex . 
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