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
Swansea Castle its military importance. Alina de Mowbray ruled the Gower until 1331 when her son John de Mowbray took over as Lord of Gower. He was probably responsible for adding the arcaded parapet walk to the castle. Despite the Welsh rebellion led by Owain Glyndŵr, which saw a number of English castles attacked in the early years of the 1400s, it is not known whether Swansea fell to these forces. Swansea Castle's account books only record that two men were sent north to gather intelligence on Glyndŵr's activities. The castle owners were subsequently absentee landlords. By 1650 the castle was described