Family: William Percy / Joan de Briwere (F1508)
William de Briwere (1145-1226) 
|
Beatrice de Vaux (1149- ) |
Isabel de Briwere (1184-1233)  |
| Gracia de Briwere (1186-1223) |
| William Percy (1184-1245) |
| Joan de Briwere (1190- )
|
| Anastasia Percy (1220- ) |