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
Lord George Wellesley decorated with the Royal Humane Society Medal. He relinquished his commission in the RAFVR on 10 February 1954, retaining the rank of squadron leader. After the death of his first wife on 21 February 1947, Lord Arthur Wellesley married secondly Jean McGillivray, daughter of John McGillivray and Jane Ann Stuart, on 25 November 1955. He had a son, Richard, with his first wife. Lord Arthur Wellesley died on 31 July 1967. Lord George Wellesley Lord George Wellesley, MC (29 July 1889 – 31 July 1967) was an English soldier and airman. Wellesley was born on 29 July 1889, the son