The Duke of Roxburghe | |
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| Personal details | |
| Born | 23 April 1740 |
| Died | 1804 (aged 63–64) |
| Parent(s) | Robert Ker, 2nd Duke of Roxburghe Essex Mostyn |
| Signature |  |
John Ker, 3rd Duke of Roxburghe, KG, KT, PC (23 April 1740 – 1804) was a Scottish peer, scholar and publisher.