Robert de Ross - Pedigree | FamilyCentral
 Abt 1194 - 20 Apr 1274
 Abt 1170 - Aft 1227
 Abt 1114/19 - 12 Jun 1152
 Abt 1080/82 - 24 May 1153
 Abt 1072 - 23 Apr 1130/31
 Abt 1065 - 11 May 1138
 Abt 1085 - 13 Feb 1131
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