Welsh royal family
House of Dinefwr Traditional arms of DinefwrParent house House of Gwynedd Country Wales Founded 854; 1170 years ago (854 ) Founder Cadell ap Rhodri, Prince of Seisyllwg Titles
King of the Britons ,
King of Powys ,
King of Gwynedd ,
King of Deheubarth ,
King of Dyfed ,
King of Seisyllwg ,
Prince of Wales ,
Prince of the Welsh ,
Prince of Gwynedd ,
Prince of Deheubarth ,
Prince of Seisyllwg ,
Duke of Ciudad Rodrigo ,
Grandee of Spain ,
Earl Talbot ,
Lord Dinefwr ,
Lord of Cantref Mawr ,
Lord of Cemais ,
Lord of Kidwelly ,
Lord of Llanelli ,
Lord of Ceredigion ,
Baroness Dynevor ,
Baron Dynevor ,
Baron Talbot ,
Knight Banneret ,
Knight of the Garter ,
Connected families Estate(s)
Cadet branches
Painting of Dinefwr Castle , ancient seat of the Royal House of Dinefwr, in Deheubarth
Battle of Bosworth , where Sir Rhys ap Thomas helped secure the victory of Henry Tudor as a Commander
The ruins of Carreg Cennen Castle of Lord Rhys , it later belonged to the Crown under the Duchy of Lancaster
King Hywel Dda proclaiming his laws
The Royal House of Dinefwr was a cadet branch of the Royal House of Gwynedd , founded by King Cadell ap Rhodri (reign 872–909), son of Rhodri the Great .[ 1] [ 2] Their ancestor, Cunedda Wledig , born in late Roman Britain , was a Sub-Roman warlord who founded the Kingdom of Gwynedd during the 5th century, following the Anglo-Saxon settlement of Britain. As Celtic Britons , the House of Dinefwr was ruling before the Norman conquest , having to fight with their neighbors such as the Anglo-Saxons and Vikings , before struggling with the Normans afterwards. Many members of this family were influential in Welsh history , such as Hywel Dda , who codified Welsh law under his rule, and achieved the important title of King of the Britons , or Lord Rhys , Prince of Wales , who rebelled against Richard the Lionheart , and became one of the most powerful Welsh leaders of the Middle Ages .[ 3] [ 4]