Algernon Percy, 1st Earl of Beverley was born 21 January 1750 in London, England, United Kingdom to Hugh Percy, 1st Duke of Northumberland (1715-1786) and Elizabeth Seymour (1716-1776) and died 21 October 1830 Le Mans, Sarthe, Pays de la Loire, France of unspecified causes. He married Isabella Susannah Burrell (1750-1812) 8 June 1775 .
Children
| Name | Birth | Death | Joined with |
| George Percy, 5th Duke of Northumberland (1778-1867) | 22 June 1778 | 22 August 1867 | Louisa Harcourt Stuart-Wortley (1781-1848) |
| Algernon Percy (1779-1833) | |||
| Hugh Percy (1784-1856) | |||
| Josceline Percy (1784-1856) | |||
| Henry Percy (1785-1825) | |||
| William Henry Percy (1788-1855) | |||
| Francis John Percy (1790-1812) | |||
| Charles Greatheed Bertie Percy (1794-1870) | |||
| Charlotte Percy (-1862) | |||
| Emily Charlotte Percy (-1877) | |||
| Elizabeth Percy (-1779) | |||
| Louisa Margaret Percy (-1796) | |||
Siblings
| Name | Birth | Death | Joined with |
| Hugh Percy, 2nd Duke of Northumberland (1742-1817) | |||
| Algernon Percy, 1st Earl of Beverley (1750-1830) | 21 January 1750 London, England, United Kingdom | 21 October 1830 Le Mans, Sarthe, Pays de la Loire, France | Isabella Susannah Burrell (1750-1812) |
| Elizabeth Anne Frances Percy (-1761) | |||
| Name | Birth | Death | Joined with |
| James Smithson (c1765-1829) | |||