Earl of Mornington used as a courtesy title by the heir apparent to the Marquess of Douro, himself the heir apparent to the Duke of Wellington. As of 2015 the title is held by courtesy by Arthur Wellesley, Earl of Mornington, son of Arthur Wellesley, Marquess of Douro and grandson of Charles Wellesley, 9th Duke of Wellington. The Wesley or Wellesley family descended from Sir Richard de Wellesley (15th century). His grandson Sir William Wellesley (died 1602) lived at Dangan Castle, County Meath. The family estates passed down the male lines. One of Wellesley's daughters, Alison, married John Cusack. Their son Sir Thomas
Richard Wellesley, 1st Marquess Wellesley Richard Wellesley, 1st Marquess Wellesley Richard Colley Wellesley, 1st Marquess Wellesley (20 June 1760 – 26 September 1842) was an Irish and British politician and colonial administrator. He was styled as Viscount Wellesley until 1781, when he succeeded his father as 2nd Earl of Mornington. In 1799, he was granted the Irish peerage title of Marquess Wellesley. He first made his name as Governor-General of Bengal between 1798 and 1805, and he later served as Foreign Secretary in the British Cabinet and as Lord Lieutenant of Ireland. He was the eldest son of The 1st Earl of Mornington, an Irish