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
William Wellesley-Pole, 3rd Earl of Mornington 1835 Postmaster-General. From 1838 he held the honorary position of Captain of Deal Castle. On the death in 1842 of his elder brother Richard Wellesley, 1st Marquess Wellesley and 2nd Earl of Mornington, he succeeded as 3rd Earl of Mornington. In 1784 Lord Mornington married Katherine Elizabeth Forbes, daughter of Admiral John Forbes and granddaughter of the George Forbes, 3rd Earl of Granard, and of William Capell, 3rd Earl of Essex. They had the following progeny, one son and three daughters: He died on 22 February 1845. William Wellesley-Pole, 3rd Earl of Mornington William Wellesley-Pole, 3rd Earl of Mornington (20