King of Gwynedd 1005-1023
King of Powys 999-1023
King of Deheubarth 1018-1023
Supposed grandson to Elsiedd Anaward, great grandson to Idwal Anaward (son
of Anaward Rhodri), both killed in battle against Edmund the Magnificent
942.
Claimed the throne of Gwynedd after the death of Cynan Hywel.
Married Angharad, daughter of Maredydd Owain
Established new dynasty to rebuild Wales.
1018 Deheubarth was shared by his cousins Edwin and Cadell who were killed
by usurper Aeddan Blegwryd
Llywelyn defeated Aeddan and his sons, reunited Gwynedd and Deheubarth again.
1022 Defeated another claimant to the throne, Rhain Maredydd, possible brother
in law.
Had a great vision for Wales but only his son, Gruffydd Llywelyn was able
to put it into effect.
The throne was seized by Iago Idwal Meurig, great great grandson of Anaward
Rhodri (Anaward, Idwal, Meurig, Idwal, Iago) in 1023, murdered in 1039.
52 ED26
Llywelyn ap Seisyll (died 1023) was a King of Gwynedd and of Deheubarth in north-west and south-west Wales.
Little is known about Llywelyn's father Seisyll, who may not have been of royal blood, though Llywelyn's mother Angharad was the daughter of Maredydd ab Owain, who ruled much of both northern and southern Wales for a period.
Llywelyn won control of Gwynedd in 1018 when he defeated Aeddan ap Blegywryd in battle, killing him and his four sons. He later gained control of Deheubarth, defeating Rhain, an Irish pretender who claimed to be the son of Maredydd ab Owain, at Abergwili in 1022. According to the annals in Brut y Tywysogion, Llywelyn's reign was a period of prosperity, "there was no one needy in his realm, and there was no town empty or deserted". His reign was cut short by his premature death in 1023.
His son, Gruffydd ap Llywelyn, though still a youth when his father died, was later able to gain control of almost the whole of Wales.
http://en.wikipedia.org/wiki/Llywelyn_ap_Seisyll