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William Cavendish, 3rd Duke of Devonshire (26 September 1698 - 5 December 1755) married Catherine Hoskins (or Hoskyn) (died 8 May 1777). He served as Lord Privy Seal from 1731 to 1733.
| Preceded by: In Commission | Lord Privy Seal 1731–1733 | Followed by: The Earl of Chesterfield | Lord Steward 1733–1737 | Followed by: The Duke of Dorset |
| Preceded by: The Duke of Dorset | Lord Lieutenant of Ireland 1737–1744 | Followed by: The Earl of Chesterfield | ||
| Preceded by: The Duke of Dorset | Lord Steward 1744–1749 | Followed by: The Duke of Marlborough |