House of Dinefwr

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House of Dinefwr
Flag of Deheubarth.svg
Banner of the House of Dinefwr
Country Wales
Parent house House of Manaw
Titles King of the Britons, King of Dyfed, King of Deheubarth, King of Powys, Prince of Seisyllwg, Prince of Gwynedd, Prince of Deheubarth
Founded 854
Founder Cadell ap Rhodri, Prince of Seisyllwg
Cadet branches
Dinefwr Castle

The House of Dinefwr was a royal house of Wales and refers to the descendants of Cadell ap Rhodri King of Seisyllwg, son of Rhodri the Great.

With the death of Rhodri Mawr, the kingdom of Gwynedd passed to his eldest son Anarawd ap Rhodri. Rhodri's second son Cadell ap Rhodri, however, looked outside Gwynedd's traditional borders and took possession of the Dark Ages kingdom of Dyfed by the late 9th century, establishing his capital at the citadel of Dinefwr. Cadell ap Rhodri's descendants are designated Dinefwr after the citadel from which they would rule Dyfed. The Dinefwr dynasty under king Hywel Dda would unite Dyfed and Seisyllwg into the kingdom of Deheubarth in the early 10th century. The Dinefwr dynasty would rule in Deheubarth until their conquest by the Anglo-Normans in the 13th century. This branch would compete with House Aberffraw for supremacy and influence in Wales throughout the 10th, 11th, and 12th century, with Powys variously ruled between them. Eventually, a cadet branch of Dinefwr would establish itself in Powys by the mid 11th century, designated Mathrafal after the castle there.

Descendant houses[edit]

The Tudor dynasty of Wales and England were female line descendants of the House of Dinefwr through their ancestor Owen Tudor.

The FitzGerald dynasty and related families of Ireland are female line descendants of the Welsh royal family through Nest, daughter of Rhys ap Tewdwr, last King of Deheubarth, whose descendants include Elizabeth I, John F. Kennedy, and Diana Princess of Wales.