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 ap Dyfnwal (fl. 934) overawe and intimidate neighbouring potentates. Surviving charter evidence, dating to September 934, reveals that the defeated Custantín submitted to Æthelstan, and was then in the latter's presence witnessing a charter to one of English king's household men. The actual record of this charter is preseved by a fourteenth-century chartulary. Such mediaeval chartularies commonly abbreviated witness lists. Remarkably, no Welsh potentates are recorded by the witness list which could indicate that their names were not preserved by the chartulary. If correct, Owain himself could have been amongst the witnesses as well. Whatever the case, Owain certainly seems to have spent time