Paternal Family Tree: Aberffraw
Cadwallon ab Ieuaf King Gwynedd was born to Idwal "Ieuaf aka Junior" Aberffraw.
In 979 [his brother] Hywel ap Ieuaf King Gwynedd succeeded King Gwynedd.
In 980 [his brother] Hywel ap Ieuaf King Gwynedd defeated Custennin ab Iago Aberffraw, son of his former enemy [his uncle] Iago ap Idwal Aberffraw at the Battle of Anglesey, at Anglesey. Custennin ab Iago Aberffraw was killed; he was supported by the Viking Gofraid mac Arailt Ivar.
In 985 [his brother] Hywel ap Ieuaf King Gwynedd was killed by his allies.
In 985 Cadwallon ab Ieuaf King Gwynedd succeeded King Gwynedd.
In 986 Cadwallon ab Ieuaf King Gwynedd was killed by Maredudd ab Owain King Deheubarth King Powys King Gwynedd.
Kings Gwynedd: Grand Son of Idwal ap Anaward "Foel aka Bald" King Gwynedd
Kings Powys: Great x 4 Grand Son of Cadell ap Brochfael King Powys
Great x 4 Grandfather: Gwriad ap Elidyr Aberffraw
Great x 3 Grandfather: Merfyn "Frych aka Freckled" King Gwynedd -2 x Great Grandson of Merfyn "Frych aka Freckled" King Gwynedd
Great x 4 Grandmother: Esyllt Anglesey
Great x 2 Grandfather: Rhodri ap Mervyn "The Great" King Gwynedd son of Merfyn "Frych aka Freckled" King Gwynedd
Great x 4 Grandfather: Cadell ap Brochfael King Powys son of Brochfael ap Elisedd King Powys
Great x 3 Grandmother: Nest ferch Cadell Cadelling Queen Consort Gwynedd daughter of Cadell ap Brochfael King Powys
Great x 1 Grandfather: Anaward Aberffraw son of Rhodri ap Mervyn "The Great" King Gwynedd
Great x 3 Grandfather: Meurig King Seisyllwg
Great x 2 Grandmother: Angharad Seisyllwg Queen Consort Gwynedd
Grandfather: Idwal ap Anaward "Foel aka Bald" King Gwynedd Grandson of Rhodri ap Mervyn "The Great" King Gwynedd
father: Idwal "Ieuaf aka Junior" Aberffraw son of Idwal ap Anaward "Foel aka Bald" King Gwynedd
Cadwallon ab Ieuaf King Gwynedd Grandson of Idwal ap Anaward "Foel aka Bald" King Gwynedd