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 (died 1015) men are indeed different people, they could well have been closely related, with the latter perhaps being a son of Owain's brother Máel Coluim. The likelihood that there were indeed two contemporary Cumbrian rulers named "Owain" could account for Owain Foel's epithet (meaning "the bald"). According to the twelfth-century "Historia regum Anglorum", Owain Foel assisted his Scottish counterpart, Máel Coluim mac Cináeda, against the English at the Battle of Carham in 1018. Either Owain himself, or his like-named grandfather Owain ap Dyfnwal, King of Strathclyde (fl. 934), or else their ultimate royal successor Owain Foel may be identical to Owain