stipulations laid down at Montgomery and severely curbed Llywelyn's power. In December 1282, fifteen years after the original treaty, the army of Montgomery marched to Builth Wells from Montgomery Castle, to surprise and kill Llywelyn. After 1295 and the final Welsh War of the thirteenth century, the castle became more of a military backwater and prison than a front line fortress. See also History of Wales List of treaties References Pryce, Huw. The Acts of Welsh Rulers 1120–1283 (University of Wales Press, 2005), no. 363, pp. 536–542. 1267 in England 13th century in Wales 13th century in England Montgomery Montgomery Montgomery History of Montgomeryshire 1267 in Wales England–Wales relations Henry III of England