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, 4th Duke of Wellington member of the Marlborough Club, a gentleman's club. The Duchess died on 24 June 1927 at Apsley House and was interred on 28 June at Stratfield Saye. Wellesley died at Ewhurst Park, Basingstoke, Hampshire, on 18 June (Waterloo Day) 1934, aged eighty-five, and was buried three days later at Stratfield Saye House, Basingstoke, Hampshire, the ancestral home of the Dukes of Wellington. His son, Arthur, succeeded him to the Wellesley family estates and titles. The Duke received the Knight Grand Cross of the Royal Victorian Order (GCVO) on 1 May 1902. He was appointed a Knight of the Order of