Dictionary of Welsh Biography

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JOAN (d. 1237 ), princess ;

natural daughter of king John by an unknown mother. She was betrothed to Llywelyn ap Iorwerth (q.v.) in 1204 , and m. to him in 1205 . Her role as ambassadress and intermediary between her husband and the Crown in the period 1211-32 was an important one. In spite of the tragic liaison with William de Breos (see Braose family ), which resulted in a short term of imprisonment for Joan , Llywelyn 's attachment to her appears to have been genuine. When she d. at the palace of Aber on 2 Feb. 1237 her body was conveyed across the Menai and buried in a new cemetery near the manor of Llan-faes , where Llywelyn founded a Franciscan friary in her memory. She was the mother of Dafydd ap Llywelyn (q.v.) . [A stone coffin, removed from Llan-faes at the Dissolution, and now preserved in S. Mary's church at Beaumaris , is reputed to be hers.]


  • A History of Wales: from the Earliest Times to the Edwardian Conquest ;
  • Oxford Dictionary of National Biography


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

Published date: 1959