Idonea de Malpas was born circa 1243 in England to David de Malpas and died 1293 England of unspecified causes. She married Urian de St. Pierre (c1240-1293) .
Children
| Name | Birth | Death | Joined with |
| Katherine de St. Pierre (c1266-) | Randolph de Thornton (c1254-) William de Venables (-aft1300) | ||
| Joan de St. Pierre (-aft1298) | 1298 England | Hugh de Dutton (-1294) | |
Siblings