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
Longtown Castle were given to garrison it with 30 men. The castle began to decline in importance, however, and in 1369 passed to the Despensers and then the Beauchamps, neither of whom used the castle. It was temporarily refortified by Henry IV in response to the Owain Glyndŵr uprising in North Wales in 1403. The Nevilles acquired the property in the 15th century and it remained in the control of the Lords of Abergavenny until the 1970s. After the Black Death the town's population fell away sharply as well, the protected area north of the castle was abandoned, and by the 16th