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At first friendly with Llywelyn ap Iorwerth , Madog deserted his cousin when the latter's fortunes were at a low ebb in 1211 . He continued to hold aloof after Llywelyn , in 1212 , had re-formed the Welsh confederacy, being treated as an official ally in king John 's pay. By 1215 he had adhered finally to Llywelyn 's cause, remaining faithful to the end.
After his death in 1236 the unity of Powys Fadog was disrupted by partible succession among his five sons, Gruffydd Maelor II , Gruffydd Iâl , Maredudd , Hywel , and Madog Fychan . He was buried at his own foundation of Valle Crucis , the last Cistercian monastery to be founded in Wales .
Professor Thomas Jones Pierce, M.A., F.S.A., (1905-1964), Aberystwyth
Published date: 1959