Adda ap Iorwerth Drwyndwn 
Adda ap Iorwerth was born before 1174. Adda ap Iorwerth's father was Iorwerth Drwyndwn ap Owain Gwynedd and her mother was Marared verch Madoc of Powys. Her paternal grandfather was Owain Fawr Gwynedd ap Gruffydd and her paternal grandmother is Gwladys verch Llywarch; her maternal grandfather was Madoc ap Maredudd and her maternal grandmother is Susanna verch Gruffydd of Gwynedd. She had a brother named Llywelyn Fawr the Great ap Iowerth of. She is the younger of the two children.-
Ancestor Pedigree Chart
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*There are earlier generations for the ancestor(s) indicated. See their page(s) for details (click name)
- b.Bet 974 and 984 in Aberffro, Malltraeth, Anglesey, Wales d.1039 in Battle
- b.~ 1014 in Aberffro, Malltraeth, Anglesey, Wales d.~ 1060
- b.< 1000
- b.1055 in Dublin, Ireland d.Bet 1137 and 1157 in Caernarvonshire, Wales
- b.< 1030
- b.< 1042 d.> 1055
- b.< 1014
- b.~ 1110 in Caernarvonshire, Wales d.Dec 1169 in Caernarvonshire, Wales
- b.1020 in Tegeingl, Flintshire, Wales d.1073 in Northop, Coleshill, Flintshire, Wales
- b.~ 1044 in Llys Edwin, Llaneurguin, Flintshire, Wales d.1105
- b.~ 1024
- b.< 1070 d.~ 1162
- b.Bet 970 and 1030 d.> 1079
- b.~ 1048 in Tegaingl, Flintshire, Wales d.> 1073
- b.Bet 980 and 1000 in Llys Y Coed, Cilcain, Flintshire, Wales d.> 1070
- b.< 1169 in Aberffraw Castle3, Aberffraw, Anglesey, Wales d.1174 in Pennant Mehangell
- b.Bet 960 and 980 in Powys, Wales
- b.< 1025 in Arwystli, Montgomeryshire, Wales d.1081 in Battle of Carno, Arwystli, Montgomeryshire, Wales
- b.~ 0976
- b.~ 1070 in Arwystli, Montgomeryshire, Wales d.~ 1129 in North Wales
- b.1011 in Rhuddlan, Flintshire, Wales d.05 Aug 1063
- b.Bet 1055 and 1057 in Rhuddlan, Flintshire, Wales d.> 1070
- b.Bet 1034 and 1042 in Mercia, England d.1086
- b.~ 1098 in Arwystli, Montgomeryshire, Wales
- b.0975 in Radnorshire, Wales
- b.~ 1020 in Radnorshire, Wales d.> 1060
- b.~ 0979 in Morgannwg, Wales
- b.~ 1060 in Radnorshire, Wales
- b.~ 1000 d.> 1026
- b.~ 1026 in Radnorshire, Wales d.> 1060
- b.< 1174
- b.Bet 978 and 1002 in Powys, Wales d.Bet 1023 and 1025
- b.~ 1025 in Montgomeryshire, Wales d.Bet 1072 and 1075 in Powys Castle, Wales
- b.0982 in Deheubarth, Wales d.> 1011
- b.~ 1047 in Montgomeryshire, Wales d.Bet 1124 and 1132
- b.~ 0993 d. in Gest, Dolbenmaen, Caenarvonshire, Gestyn-Efionydd, Wales
- b.~ 1025 in Dyffryn Clwyd, Denbighshire, Wales
- b.~ 0997 in Gest Nr Penmorfa, Carnarvonshire, Wales
- b.~ 1091 in Montgomeryshire, Wales d.1160 in Winchester, Hampshire, England
- b.~ 0994 in Powys, Wales
- b.~ 1020 in Dyffryn Clwyd, Denbighshire, Wales d.> 1063
- b.< 0998 d. in Powys, Wales
- b.~ 1063 in Dyffryn Clwyd, Denbighshire, Wales
- b.< 0998 d. in Denbighshire, Wales
- b.~ 1024 in Denbighshire, Wales
- b.Bet 1129 and 1157 in Montgomeryshire, Wales d.Bet 1196 and 1201
- b.Bet 974 and 984 in Aberffro, Malltraeth, Anglesey, Wales d.1039 in Battle
- b.~ 1014 in Aberffro, Malltraeth, Anglesey, Wales d.~ 1060
- b.< 1000
- b.1055 in Dublin, Ireland d.Bet 1137 and 1157 in Caernarvonshire, Wales
- b.< 1030
- b.< 1042 d.> 1055
- b.< 1014
- b.Bet 1095 and 1110 in Caernarvonshire, Wales
- b.1020 in Tegeingl, Flintshire, Wales d.1073 in Northop, Coleshill, Flintshire, Wales
- b.~ 1044 in Llys Edwin, Llaneurguin, Flintshire, Wales d.1105
- b.~ 1024
- b.< 1070 d.~ 1162
- b.Bet 970 and 1030 d.> 1079
- b.~ 1048 in Tegaingl, Flintshire, Wales d.> 1073
- b.Bet 980 and 1000 in Llys Y Coed, Cilcain, Flintshire, Wales d.> 1070
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