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
Strata Florida Abbey the "Brut y Tywysogion", was compiled at Strata Florida. In 1401, during the early years of Owain Glyndŵr's rebellion, Strata Florida Abbey was taken by King Henry IV and his son. The monks were deemed to be sympathetic to Glyndŵr, so they were evicted from the monastery, which was plundered. Henry IV turned the religious buildings into a military base as he planned to capture or defeat any Welsh rebel forces active in the area. By 1402 the Earl of Worcester held the Abbey for the English Crown with a garrison of several hundred men-at-arms, archers and foot soldiers. It