Idwal ap Gruffydd - Pedigree | FamilyCentral
 Abt 1057 -
 Abt 1011 - 5 Aug 1063
 Abt 1025 - Aft 1086
Family Group
 14 May 978 - 31 Aug 1057
 Abt 980 - 10 Sep 1067
 Abt 968 - 23 Apr 1016
 946 - Bef 1032
 Abt 943 - 8 Jul 975