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 Gwynedd challenge English rule. King Henry again invaded Gwynedd in 1165, but instead of taking the usual route along the northern coastal plain, the king's army invaded from Oswestry and took a route over the Berwyn hills. The invasion was met by an alliance of all the Welsh princes, with Owain as the undisputed leader. However, apart from a small melee at the Battle of Crogen there was little fighting, for the Welsh weather came to Owain's assistance as torrential rain forced Henry to retreat in disorder. The infuriated Henry mutilated a number of Welsh hostages, including two of Owain's sons.