Gertrude de Flanders - Pedigree | FamilyCentral
 Abt 1064 - 1117
 Abt 1033 - 13 Oct 1093
 Abt 1028 - 4 Aug 1113
 27 Mar 972 - 20 Jul 1031
 Abt 986 - 25 Jul 1032
 Abt 939 - 24 Oct 996
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