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
Arthur Wellesley, 1st Duke of Wellington and status, Kitty Pakenham's family had consented to his marrying her. Wellesley and Kitty were married in Dublin on 10 April 1806. The marriage would prove to be unsatisfactory and the two would spend years apart while Wellesley was campaigning. Kitty grew depressed, while Wellesley pursued other sexual and romantic partners. However the marriage produced two sons, Arthur, in 1807, and Charles, in 1808. They lived apart for most of the time and occupied separate rooms in the house when they were together. Her brother, Edward "Ned" Pakenham, served under Wellesley throughout the Peninsular War and Wellesley's regard for him