Dictionary of Welsh Biography

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GRUFFYDD ap RHYDDERCH ap IESTYN (d. 1055 ), king .

When Gruffudd ap Llywelyn (q.v.) took possession of Deheubarth in 1044 , the South found a new focus of resistance in the leadership of Gruffydd ap Rhydderch . Independence was thus retrieved in 1045 , and for ten years, until his fall in 1055 , Gruffydd gave to his adopted ‘patria’ a vigorous government in which resistance to the Danes was a prominent feature. The sanction for his intervention in the affairs of Deheubarth came in part from his father's successful usurpation of power there during the years 1023-33 . Gruffydd , moreover, was already a ‘ king ’ in Glamorgan , probably over Gwynllwg , where his descendants enjoyed restricted power down to 1270 .


  • A History of Wales: from the Earliest Times to the Edwardian Conquest , 361-4, table 771;
  • The Transactions of the Honourable Society of Cymmrodorion , 1899-1900 , 122 et seq.


Professor Thomas Jones Pierce, M.A., F.S.A., (1905-1964), Aberystwyth

Published date: 1959