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The Duke of Ancaster and Kesteven | |
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| 4th Duke of Ancaster and Kesteven | |
| Reign | 1778–1779 |
| Predecessor | Peregrine Bertie, 3rd Duke of Ancaster and Kesteven |
| Successor | Brownlow Bertie, 5th Duke of Ancaster and Kesteven |
| Born | 17 October 1756 Grimsthorpe |
| Died | 8 July 1779 (aged 22) Grimsthorpe |
| Cause of death | Scarlet fever |
| Buried | 22 July 1779 Edenham |
| Noble family | Bertie |
| Issue | Susan |
| Father | Peregrine Bertie, 3rd Duke of Ancaster and Kesteven |
| Mother | Mary Panton |
Robert Bertie, 4th Duke of Ancaster and Kesteven, PC (17 October 1756 – 8 July 1779), styled Lord Robert Bertie until 1758 and Marquess of Lindsey between 1758 and 1778, was a British peer.