Agnes de Percy was born in Alnwick to William de Percy (1112-c1175) and Alice de Clare (c1115-aft1148) and died 1203 of unspecified causes. She married Jocelin de Louvain (c1126-1180) .
Children
| Name | Birth | Death | Joined with |
| Henry de Percy (-c1194) | 1170 | 1194 | Isabel de Brus |
| Richard de Percy (-1244) | 1170 | 1244 | |
| Joscelin de Percy | |||
| Radulph de Percy | |||
| Eleanor de Percy | |||
| Maud de Percy | |||
| Lucy de Percy | |||
Residences
Footnotes (including sources)
| ‡ General |