William Fitzwilliam, Knight - Pedigree | FamilyCentral
 Abt 1275 - Aft 11 Apr 1340
 Abt 1242 - Bef 1295
 Abt 1209 - Aft 1252
 Abt 1174 - Aft 9 Feb 1218/19
 Abt 1140 - Bef 1195
 Abt 1128 - Aft 1193