Dafydd ap Llywelyn

Lore & Background

Dafydd ap Llywelyn was born shortly after Easter 1212 at Castell Hen Blas, the only son of Llywelyn the Great and Joan, Lady of Wales. His father worked to secure Dafydd's succession over his older half-brother Gruffydd, gaining recognition from King Henry III in 1220 and having Joan declared legitimate by Pope Honorius III. After Llywelyn suffered a paralytic stroke in 1237, Dafydd took an increasing role in government and ruled Gwynedd following his father's death in 1240.

Henry III invaded Gwynedd in August 1241, forcing Dafydd to submit under the Treaty of Gwerneigron, surrendering lands outside Gwynedd and handing over Gruffydd. Gruffydd died in March 1244 while trying to escape the Tower of London, freeing Dafydd to ally with other Welsh princes and attack English possessions. He recovered Mold Castle and possibly Dyserth Castle, and secured temporary papal recognition of his right to rule North Wales, though this was reversed in 1245.

Henry invaded again in August 1245, reaching the river Conwy and building a castle at Deganwy. After savage fighting and Welsh capture of English supplies, a truce was agreed and Henry withdrew. The war ended with Dafydd's sudden death in February 1246 at Abergwyngregyn. He was buried at Aberconwy Abbey. The writer of Brut y Tywysogyon called him 'tarian Cymru' – the shield of Wales.

Reader's Guide

Dafydd ap Llywelyn's significance lies in his role as a Welsh prince who both submitted to and resisted English royal authority, embodying the tensions of medieval Welsh independence. His father's efforts to secure his succession, including papal legitimation of his mother, highlight the importance of dynastic legitimacy in Welsh law, which recognized the claims of his half-brother Gruffydd. Dafydd's initial defeat in 1241 and subsequent recovery after Gruffydd's death demonstrate the precarious nature of Welsh power against Henry III. His diplomatic outreach to Louis IX of France and Pope Innocent IV shows an early attempt to internationalize Welsh resistance. Though his reign was short, his posthumous description as 'the shield of Wales' reflects his symbolic importance. His failure to produce an heir led to the division of Gwynedd between Gruffydd's sons, Llywelyn ap Gruffudd and Owain Goch ap Gruffydd, who continued the conflict with England. Dafydd's legacy is thus tied to the broader struggle for Welsh autonomy and the dynastic politics that shaped medieval Gwynedd.

Did You Know?

• Dafydd's birth year is uncertain, with 1208, 1206, and 1215 proposed, but it has been persuasively argued he was born shortly after Easter 1212.
• His mother Joan, Lady of Wales, was the daughter of King John of England.
• He sent ambassadors to the court of Louis IX of France to explore alliances against Henry III.
• The writer of Brut y Tywysogyon described Dafydd as 'tarian Cymru' – the shield of Wales.