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
Caerphilly Castle stores and £14,000 held at the castle. William la Zouche besieged the castle with a force of 425 soldiers, cornering the constable, Sir John de Felton, Hugh's son – also called Hugh – and the garrison of 130 men inside. Caerphilly held out until March 1327, when the garrison surrendered on the condition that the younger Hugh was pardoned, his father having been already executed. Tensions between the Welsh and the English persisted and spilled over in 1400 with the outbreak of the Glyndŵr Rising. It is uncertain what part the castle played in the conflict, but it seems to