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
Arthur Wellesley, 1st Duke of Wellington his brother's term as Governor-General of India ended in March 1805, the brothers returned together to England on HMS "Howe". Arthur, coincidentally, stopped on his voyage at the little island of Saint Helena and stayed in the same building to which Napoleon I would later be exiled. In September 1805, Major-General Wellesley was newly returned from his campaigns in India and was not yet particularly well known to the public. He reported to the office of the Secretary for War to request a new assignment. In the waiting room he met Vice-Admiral Horatio Nelson, already a legendary figure after his