and generous". In 1207 Maelgwn's ally, Gwenwynwyn of Powys fell out with King John and his lands were taken into the custody of the crown. Llywelyn the Great of Gwynedd took advantage of this to annex the northern part of Ceredigion from Maelgwn and to give the lands between the River Ystwyth and the River Aeron to the sons of Gruffydd. Maelgwn helped King John to force Llywelyn to come to terms in 1211 but these lands were not returned to him, and this induced him to throw in his lot with Llywelyn instead of the king. However, when Llywelyn held a parliament at Aberdyfi in 1216, at which he redistributed the lands formerly under the rule of the Lord Rhys, Maelgwn was still only allowed the southern part of Ceredigion. Maelgwn died in 1230 in Llannerch Aeron and was buried at Strata Florida Abbey. His territory passed to his son, Maelgwn ap Maelgwn, called Maelgwn Fychan. In the late 1230s, the latter agreed a treaty with Gilbert Marshal, 4th Earl of Pembroke, whereby Maelgwn Fychan's son, Rhys, would marry Gilbert's illegitimate daughter, Isabel, and receive the cantref of Is-Aeron, except the commote of Is-Hirwen (which contained Cardigan Castle), as dowry; in return Maelgwn Fychan and Rhys would become vassals of Gilbert (so far as it didn't compromise fealty to the king). References John Edward Lloyd (1911) A history of Wales from the earliest times to the Edwardian conquest (Longmans, Green & Co.) 1230 deaths Monarchs of Deheubarth Year of birth uncertain 13th-century Welsh monarchs