Llywelyn ap Seisyll (died 1023) was a King of Gwynedd and of Deheubarth in north-west and south-west Wales, also called King of the Britons by the Annals of Ulster.
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Lineage
Little is known about Llywelyn's father Seisyll, who may not have been of Royal blood. According to some genealogies Siesyll and his son Llywelyn were associated with Rhuddlan, perhaps originally as lords of the Rhuddlan commote in Rhos.[1] Llywelyn's wife Angharad was the daughter of Maredydd ab Owain, who ruled much of both northern and southern Wales for a period.
Military successes
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 Maredudd 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.
Succession
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.
References
- ^ http://homepage.mac.com/donok/PS03/PS03_334.HTM LLYWELYN Ap SEISYLL
- John Edward Lloyd (1911). A history of Wales: from the earliest times to the Edwardian conquest. Longmans, Green & Co..
- editors: John Edward Lloyd, R.T. Jenkins (1959). The Dictionary of Welsh Biography Down to 1940. Oxford.
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| Preceded by Aeddan ap Blegywryd |
King of Gwynedd 1018–1023 |
Succeeded by Iago ab Idwal ap Meurig |
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