Llywelyn ab Iorwerth

Llywelyn ab Iorwerth, known as Llywelyn the Great, was a prince of Gwynedd who ruled much of Wales from 1195 until his death in 1240.

Principality of Gwynedd: A medieval Welsh principality centered on Gwynedd in northwestern Wales. Its resources and dynastic legitimacy formed the base of Llywelyn’s rule.
Iorwerth ab Owain: A Welsh noble of Gwynedd and the father of Llywelyn ab Iorwerth. Llywelyn’s patronymic identifies him as Iorwerth’s son.
Joan, Lady of Wales: The daughter of King John of England and wife of Llywelyn ab Iorwerth. Her royal marriage linked Gwynedd’s ruler to the English royal family.
Treaty of Worcester: The 1218 settlement between Llywelyn ab Iorwerth and the government of Henry III of England. It secured English recognition of Llywelyn’s holdings after years of conflict.
Welsh law: The customary legal traditions practiced in medieval Wales, including rules on inheritance and governance. Welsh legal customs shaped succession and the political order Llywelyn sought to command.
Owain Gwynedd: A twelfth-century prince of Gwynedd who expanded Welsh power before his death in 1170. His death left a contested succession that fractured the dynasty Llywelyn later reunited.
Dafydd ap Llywelyn: The son of Llywelyn ab Iorwerth who succeeded him as ruler of Gwynedd. Llywelyn’s choice of Dafydd as heir provoked opposition from other members of the dynasty.
Treaty of Strata Florida: The 1238 agreement by which Welsh rulers acknowledged Dafydd ap Llywelyn as heir to Gwynedd. Llywelyn used the gathering to strengthen his son’s claim before his own death.
Treaty of Aberconwy: The 1277 agreement that compelled Llywelyn ap Gruffudd to surrender much of his territory to Edward I. Its later settlement shows how English royal authority eventually constrained Gwynedd’s rulers.
Dafydd ab Owain Gwynedd: A prince of Gwynedd who ruled parts of the principality during its late-twelfth-century succession struggles. Dafydd’s rule and the family’s rival claims shaped Llywelyn’s early struggle for power.

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