Biography of Thomas Pelham-Clinton, 3rd Duke of Newcastle under Lyne (1752-1795)
- William Cavendish, 1st Duke of Newcastle upon Tyne (1593-1676)
- Margaret Cavendish, Duchess of Newcastle upon Tyne (c.1623-1673)
- Henry Cavendish, 2nd Duke of Newcastle upon Tyne (1630-1691)
- John Holles, 3rd Duke of Newcastle upon Tyne and 4th Earl of Clare (1662-1711)
- Thomas Pelham-Holles, 4th Duke of Newcastle upon Tyne (1st Duke of 3rd creation) and 1st Duke of Newcastle under Lyne (or Line) (1693-1768)
- Henry Pelham (c.1695-1754; Prime Minister)
- Henry Fiennes Pelham-Clinton, 2nd Duke of Newcastle under Lyne (1720-1794)
- Sir Henry Clinton (1730-1795; army general)
- Thomas Pelham-Clinton, 3rd Duke of Newcastle under Lyne (1752-1795)
- Henry Pelham-Clinton, 4th Duke of Newcastle under Lyne (1785-1851)
- Henry Pelham-Clinton, 5th Duke of Newcastle under Lyne (1811-1864)
- Henry Pelham Alexander Pelham-Clinton, 6th Duke of Newcastle (1834-1879)
- Henry Pelham Archibald Douglas Pelham-Clinton, 7th Duke of Newcastle (1864-1928)
- Henry Francis Hope Pelham-Clinton-Hope, 8th Duke of Newcastle (1866-1941)
- Henry Edward Hugh Pelham-Clinton-Hope, 9th Duke of Newcastle (1907-1988)
- Edward Charles Pelham-Clinton, 10th Duke of Newcastle (1920-1988)
Thomas was the 3rd son of the 2nd Duke of Newcastle under Lyne and his wife, Lady Catherine Pelham, succeeding to the title unexpectedly after the death of his two elder brothers. After his education, possibly at the Academy of Angers, he embarked on a military career. He served in America during the American War of Independence as A.D.C. to his relative, General Sir Henry Clinton, and was later A.D.C. to the King. He ultimately achieved the rank of Major General, in 1787.
Though he also dabbled in politics, as M.P. for Westminster (1774-1780) and East Retford (1781-1794), unlike his illustrious relatives he never achieved national office. He did, however, hold several local offices, including Steward of Sherwood Forest and Lord Lieutenant of Nottinghamshire.
After succeeding to his title in February 1794, Thomas was duke for little more than a year, dying in May 1795 from the effects of an emetic which he had taken for whooping cough.
3rd Duke of Newcastle under Lyne by an artist of the English School
In 1782 he secretly married Lady Anna Maria Stanhope (1760-1834), daughter of the 2nd Earl of Harrington. They had four children:
Following his marriage, which the 2nd Duke had strongly opposed, he and his father became estranged and he was virtually disinherited. Although he inherited the title, the estate was administered by trustees on behalf of the 2nd Duke's grandson, the future 4th Duke. However, the 3rd Duke's sudden death in 1795 meant that his father's affairs had not yet been finally settled.
In 1800 his widow married Lieutenant General Sir Charles Gregan Crauford.
- The accounts of his executors are held in Manuscripts and Special Collections at The University of Nottingham
- There are other items relating to the 3rd Duke's affairs scattered through the Newcastle (Clumber) Collection held in Manuscripts and Special Collections at The University of Nottingham
- To date there have been no publications about the 3rd Duke.