William Pole-Tylney-Long-Wellesley, 4th Earl of Mornington a very dissipated life and lived for a time in Brussels to avoid his creditors. In his last years he lived on a small pension of ₤10 a week allowed by his cousin Arthur Wellesley, 2nd Duke of Wellington. From 1842 he was styled Viscount Wellesley, and succeeded his father as Earl of Mornington in 1845. He died in lodgings in Thayer Street, Manchester Square, London, on 1 July 1857, from heart disease. The obituary notice three days later in the "Morning Chronicle" claimed that he was "A spendthrift, a profligate, and a gambler in his youth, he became debauched
Lord George Wellesley Military Cross in 1916. Lord Arthur Wellesley married Louise Nesta Pamela FitzGerald, daughter of Sir Maurice FitzGerald, 2nd Baronet, and Amelia Catherine Bischoffsheim, on 12 March 1917 at Saint Thomas Church in Manhattan, New York City. She was the widow of his elder brother Richard. Lord Arthur Wellesley was appointed a wing commander in the RFC, with the temporary rank of lieutenant colonel, on 1 October 1917. He gained the rank of squadron leader in 1939 in the service of the Royal Air Force Volunteer Reserve (RAFVR). He fought in the Second World War between 1939 and 1945. He was