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
Harlech Castle broke out in North Wales against English rule, led by Owain Glyndŵr. By 1403 only a handful of castles, including Harlech, still stood against the rebels, but the castle was under-equipped and under-staffed to withstand a siege, the garrison having just three shields, eight helmets, six lances, ten pairs of gloves, and four guns. At the end of 1404, the castle fell to Glyndŵr. Harlech became his residence, family home and military headquarters for four years; he held his second parliament in Harlech in August 1405. In 1408 English forces under the command of the future Henry V placed Harlech