Gwilym ap Tudur Rhys and Owain Glyndŵr. As a result, the Tudur brothers began planning an attack on Conway Castle. On Good Friday, 1 April 1401, the brothers and 44 men (which included those who had also been excluded from the pardons) infiltrated the castle. They had pretended to be carpenters, and captured the castle while the guard were in church. Negotiations began for the return of the castle on 13 April, with the king represented by Henry "Hotspur" Percy and Gwilym representing the Welsh forces. After seeking a compromise, which would have resulted in pardons being given to the Welshmen, the king
Owain ab Edwin of Tegeingl Angharad, married Gruffudd ap Cynan, Prince of Gwynedd, by whom she had three sons: Cadwallon, Owain Gwynedd (the first Welsh prince to take the title "Princeps Wallensium", Prince of the Welsh) and Cadwaladr ap Gruffydd. His sons were Goronwy, Meilir, Llywelyn, Aldud, and Rhirid. Goronwy was the father of the Cristin who was the second wife of Owain Gwynedd. However, in 1125 a son of Gruffudd ap Cynan killed all Owain's male heirs bringing the direct line of the family to an end. Owain ab Edwin of Tegeingl Owain ab Edwin of Tegeingl or Owain Fradwr (Welsh: "the Traitor"; ?