Duke of Newcastle

William Cavendish, 1st Duke of Newcastle, was a son of Charles Cavendish, himself the third son of Sir William Cavendish and his wife Bess of Hardwick. One of Charles Cavendish's elder brothers became the 1st Earl of Devonshire (see Duke of Devonshire for further history about this branch of the family).

The first duke, William Cavendish, was the son of Charles Cavendish and his second wife Catherine Ogle, 8th Baroness Ogle, daughter of Cuthbert Ogle, 7th Baron Ogle. William Cavendish became Viscount Mansfield in 1620, and in 1621, he was created Earl of Newcastle upon Tyne and Baron Cavendish of Bolsover. He succeeded his mother as ninth Baron Ogle in 1629, and he became Marquess of Newcastle upon Tyne in 1643. He was elevated to the dukedom of Newcastle upon Tyne in 1665. He also was granted the title of Earl of Ogle as a subsidiary title for the dukedom, to be used as a courtesy title by his heir apparent. Upon his death in 1676, he was succeeded by his son, the second Duke, who was a politician. However, the second Duke's only son and heir apparent (Henry Cavendish, Earl of Ogle) predeceased him. Therefore, upon the second Duke's death in 1691, all of these many titles became extinct, except the barony of Ogle, which fell into abeyance between the second duke's four daughters (one of whom was Lady Elizabeth Cavendish).

The second Duke's third daughter, Lady Margaret Cavendish (1661-1717), married John Holles, 4th Earl of Clare, who was incidentally her first cousin, her mother's sister's son. In 1694, the dukedom was revived when he was created Marquess of Clare and Duke of Newcastle upon Tyne. The Holles family descended from John Holles, who was created Baron Haughton, of Haughton in Nottinghamshire, in 1616 and Earl of Clare in 1624. His second son was a politician, Denzil Holles, 1st Baron Holles. Lord Clare was succeeded by his eldest son, the second Earl. He represented East Retford, Nottinghamshire, in the House of Commons and served as Lord Lieutenant of Nottinghamshire. His son, the third Earl, was briefly MP for Nottinghamshire in 1660. He was succeeded by his son, the aforementioned fourth Earl of Clare, who married a daughter of the second Duke of Newcastle. In 1694, three years after the title became extinct, the Dukedom of Newcastle was revived and granted to the late Duke's son-in-law. The new duke of Newcastle and his wife, Lady Margaret, had only one daughter and no sons. Therefore, on his death in 1711, all his titles became extinct.

Thomas Pelham-Holles, 1st Duke of Newcastle and Prime Minister of Great Britain

The Duke's sister, Lady Grace Holles (died 1700), married Thomas Pelham, 1st Baron Pelham (see Earl of Chichester for earlier history of the Pelham family). Their elder son Thomas, upon his uncle's death in 1711, succeeded to the substantial Holles estates and assumed by Royal Licence the additional surname and arms of Holles. In 1714, the earldom of Clare was revived when he was created Viscount Haughton and Earl of Clare, with remainder to his younger brother Henry Pelham. The following year, the dukedom was revived when he was made Marquess of Clare and Duke of Newcastle upon Tyne, with like special remainder. These titles were in the Peerage of Great Britain. In 1756, when his brother died without male issue and it was evident that the Duke would have no children, the Duke of Newcastle upon Tyne was additionally created Duke of Newcastle-under-Lyne [sic] with a different special remainder: to his nephew-by-marriage Henry Clinton, 9th Earl of Lincoln, who rapidly took on the additional surname Pelham. (For the history of this title from the 1768 inheritance upon the 1st Duke's death, see Earl of Lincoln.) The 1st Duke's other titles became extinct, except for the Pelham baronetcy (of Laughton) and the barony of Pelham (of Stanmer), which devolved to his first cousin once-removed, Thomas Pelham. (For the history of these titles, see Earl of Chichester.)

Extensive personal, transaction and estate papers of the dukes are held in the Portland (Welbeck) and Newcastle (Clumber) collections at the University of Nottingham's Department of Manuscripts and Special Collections.

Clumber Park

• Clumber Park, also known as Clumber Park Lodge, spanning Clumber and Worksop, Nottinghamshire, from 1709 until 1938, when the house was demolished.
• Boyton Manor, Wiltshire, bought in the 1950s and sold about 1980.
• Newcastle House, Lincoln's Inn Fields, London, briefly in the 18th century.[3]
• Claremont, Esher, north Surrey, from 1714 to 1768.
• A house on part of the site of the dismantled Nottingham Castle, which was on the rejection of "the Reform Bill" by the Lords set on fire by a mob, at which time it had for many years been divided into separate dwellings.[4]
• The 6th Duke inherited the Hope mansion of Deepdene House, Dorking, Surrey, which was sold by the 8th Duke.

Hafod Uchtryd

• One duke bought the retreat of Cwm Elain, Dyfryn-Elain, Cwm-Toyddwr, Radnorshire, from Sir Robert Peel. It had been sold off by 1849.[5]
• The heirs of Thomas Johnes (died 1816) sold Hafod Uchtryd, in Cardiganshire, together with its estate on the Ystwith, to the 4th Duke. The process of sale took from 1831 until 1833, and the price was £70,000. The Duke spent £20,000 on the property, including adding the Havod Arms Inn, four miles from the house in Llanfihangel y Creuddyn. In 1846, he sold the estate for £95,000 to Henry Hoghton.[6][7][8]

• The 6th Duke inherited the Hope mansion of Castleblayney, County Monaghan, Ireland; this was sold by the 8th Duke.

• Camilla Long is a grand-daughter of Marjorie Pelham-Clinton (1910–2005), a first cousin of the 10th Duke and a great-granddaughter of the 4th Duke.[9]