William Pole-Tylney-Long-Wellesley, 4th Earl of Mornington

The Right Honourable The Earl of Mornington
William Pole-Tylney-Long-Wellesley, 4th Earl of Mornington - Courtesy of Greg Roberts and not to be reproduced without his permission
Member of Parliament for Essex
In office 1831–1832
Member of Parliament for St Ives
In office 1830–1831
Member of Parliament for Wiltshire
In office 1818–1820
Member of Parliament for St Ives
In office 1812–1818
Personal details
Born	22 June 1788 London, Great Britain
Died	1 July 1857 (aged 69) Thayer Street, Manchester Square, London, UK
Political party	Tory/Ultra-Tory
Spouse(s)	Catherine Tylney Long (m. 1812, d. 1825) Helena Paterson Bligh (m. 1828, d. 1869)
Profession	Politician
Religion	Anglicanism

William Pole-Tylney-Long-Wellesley, 4th Earl of Mornington (22 June 1788 – 1 July 1857), was an Anglo-Irish nobleman notorious for his dissipated lifestyle.

The great-grandfather of the subject of the present article was Henry Colley (d.1700) (or Cowley) of Castle Carbery, King's County, Ireland. The Colley family originally came from Rutland County in England, having gone to Ireland tempus Henry VIII, where they distinguished themselves as soldiers and administrators. Henry's sister Elizabeth married Garret (or Gerald) Wesley I of Dangan, Meath, younger son of Valerian Wesley and Ann Cusack. Henry's youngest son by Mary Usher, only daughter of Sir William Usher of Dublin, knight, was Richard Colley (d.1758) who in 1728, on the death without issue of his first cousin Garret Wesley II, son of his aunt Elizabeth, inherited the Wesley estates with the proviso in Garret's will that he and his heirs should adopt the name and arms of Wesley. He made the necessary formal declaration in 1728 and became known as Richard Wesley. In 1746 he was created 1st Baron Mornington, an ancient barony of Wesley ancestors. His sister Ann married William Pole of Ballyfin, Queen's County. Mornington married Elizabeth Sale, producing as heir Garret Wesley, 2nd Baron Mornington, who was created in 1760 1st Earl of Mornington in County Meath. In 1759 he married Ann Hill and produced five exceptional sons, three of whom were as follows: firstly, Richard Wesley, the eldest son, who became Governor General of India and was created 1st Marquess Wellesley; the third son was Hon. William Wesley, father of the subject of the present article; and the fifth son was Arthur, Duke of Wellington.