William de [Sir Knight] Ferrers - Pedigree | FamilyCentral
 Abt 1240 - 20 Dec 1287
 Abt 1200 - 24 Mar 1254
 Abt 1222 - Bef 12 Mar 1284
 Abt 1174 - 2 Nov 1247
 1147 - 30 Jun 1181
 Abt 1155 - 1227
 Abt 1116 -
 Abt 1120 - 29 Jul 1189
 Abt 1117/21 - 12 Mar 1181
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