Steadfast in his loyalty to the Crown during the first decade of Llywelyn II 's rise to power, he suffered a renewed loss of patrimony and a second exile in 1257 . With evident reluctance, and though deprived of the lands of Cyfeiliog lying north of the Dovey , he agreed, in 1263 , to transfer his allegiance to Llywelyn and co-operate in the latter's plan for the creation of a native feudal principality. This arrangement, confirmed in the Treaty of Montgomery ( 1267 ), lasted until 1274 , the year of the notorious plot against Llywelyn 's life, in which Hawise and her eldest son, Owen , were deeply implicated.
From the shelter of his third exile at Shrewsbury , Gruffydd (not without some suspicion of royal encouragement) continued to embarrass Llywelyn , providing in this way one of the occasions for the war of 1277 . Reinstated in his barony of Powys after Llywelyn 's humiliation, he was still without the lands north of the Dovey ; these now became the subject of legal controversy between him and the Prince of Wales , the ensuing complications being part of the web of circumstances which led to the final outbreak of hostilities in 1282 , when Gruffydd figured among the most prominent of Edward 's supporters.
He lived for five years after the conquest, dying sometime between 21 Feb. 1286 and the end of 1287 . He was survived by his wife (d. 1310 ), six sons, and one daughter. The main inheritance passed to the eldest son, OWEN DE LA POLE , and eventually, in 1309 , to John Charlton , the husband of Gruffydd 's grand-daughter, Hawise .
Professor Thomas Jones Pierce, M.A., F.S.A., (1905-1964), Aberystwyth
Published date: 1959