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
Welsh chronicles semi-legendary or semi-historical material, which however cannot be substantiated as historical with any certainty. "Brut y Brenhinedd" is the title given to Middle Welsh versions of Geoffrey of Monmouth's "Historia Regum Britanniae". "Brut y Tywysogion" is a continuation of "Historia Regum Britanniae", covering the period of 682 to 1332. The "Brenhinoedd y Saeson" survives in 14th-century manuscripts and covers events from 682 to 1282. The "Annals of Owain Glyndwr" give an account of the Glyndŵr Rising, covering the period of 1400 to 1422. Welsh chronicles A number of medieval chronicles of the history of Wales survive, notably the 9th century