Irmgard Van Guelders, Countess of Altena - Pedigree | FamilyCentral
 Abt 1150 - Aft 30 Apr 1207
 Abt 1173 - 7 Sep 1231
 Abt 1138 - 1179
 Abt 1140 - 11 Jul 1183
 Abt 1146 - 26 Mar 1191
 Abt 1091 - 1134
 Abt 1084 - 1134
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