Biography
Agnes de Cantilupe was born circa 1204 to William II de Cantilupe (-1251) and Milicent de Gournai (c1189-) . She married Robert de St. John (c1199-c1266) .
Children
| Name | Birth | Death | Joined with |
| John de St. John (c1225-1302) | 1225 | 12 September 1302 | Alice FitzPiers (c1228-) |
| Jane de St. John (c1228-?) | |||
| William de St. John (c1234-1305) | |||