Robert de Roos - Pedigree | FamilyCentral
 Abt 1275 - 1285
 Abt 1196 - Aft 1246
 Abt 1250 -
 Abt 1170 - Aft 1227
 1144 -
 1146 -
 Abt 1114/19 - 12 Jun 1152
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