Newcastle Estate Office, Clumber (Nottinghamshire)

Henry Fiennes Clinton, 9th Earl of Lincoln (1720-1794) succeeded his uncle, Thomas Pelham-Holles, 1st Duke of Newcastle under Lyne (also 4th Duke of Newcastle upon Tyne) in 1768. From this date he took the additional surname Pelham and made Clumber Park in Nottinghamshire his principal seat. Through Thomas Pelham-Holles (1693-1768) he also inherited property in Nottinghamshire, Yorkshire and Middlesex, while the bulk of the Pelham estates in Sussex and the 1st Duke's private papers were left to the direct male heir, Thomas Pelham of Stanmer, 1st Earl of Chichester (and 2nd Baron Pelham, 1728-1805).

Thomas Pelham-Holles had inherited the Pelham estates in Sussex and, through his uncle John Holles, 3rd Duke of Newcastle upon Tyne (and 4th Earl of Clare, 1662-1711), the Holles/Clare estates in Middlesex, Nottinghamshire and Lincolnshire, together with the Cavendish properties of Nottingham Castle and Clumber Park. Holles had acquired these Cavendish properties by his marriage in 1690 to Lady Margaret Cavendish (1661-1716), daughter and co-heir of Henry Cavendish, 2nd Duke of Newcastle upon Tyne (1630-1691). The major Cavendish/Newcastle properties, however, passed through Lady Henrietta Cavendish (1694-1755), daughter of the 3rd Duke of Newcastle upon Tyne and wife of Edward Harley, 2nd Earl of Oxford (1689-1741), to their daughter, Lady Margaret Cavendish Harley (1715-1785). On her marriage in 1734 to William Bentinck, 2nd Duke of Portland (1709-1762), they became part of the Portland of Welbeck estates and were inherited through the Cavendish-Bentinck family along with the records which form part of the Portland Collections.

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