Madog ap Gruffydd Maelor

Madog ap Gruffudd, or Madog ap Gruffudd Maelor, was a Prince of Powys Fadog from 1191 to 1236 in north-east Wales, and Lord of Powys. He was the founder of Valle Crucis Abbey in the Lordship of Yale.

Early life He was elder son of Prince Gruffydd Maelor and his wife, Angharad, a daughter of King Owain Gwynedd. He succeeded his father jointly with his brother, Owen, in 1191 and on Owen's death in 1197 became the sole ruler of Powys north of the River Rhaeadr and the Afon Tanat.

Madog consolidated the possessions of his father, Prince Gruffudd Maelor, and the territory he ruled became known as Powys Fadog (Fadog in Welsh is a lenited form of his name, Madog) in his honour, the remainder of the old kingdom formed Powys Wenwynwyn. After his death in 1236, this area—comprising Welsh and English Maelor, Ial (Yale), Cynllaith, Nanheudwy and Mochnant Is Rhaeadr—was still referred to as Powys Fadog although it was divided up between his five sons.

Establishment of and burial at Valle Crucis Abbey

On 28 January 1201, Madog founded the Cistercian abbey of Valle Crucis Abbey, Llangollen, Wales. The abbey was founded with monks from nearby Strata Marcella abbey.

He is buried at Valle Crucis Abbey in the abbey church, as are several of Madog's descendants. The exact site of his burial is unknown.

He is an ancestor of Owain Glyndŵr, Prince of Wales.

Marriage and children He had married Esyllt (Isolda). He had issue:

Gruffudd Maelor II, who succeeded his father, Gruffudd Iâl, died 1238 Maredudd, died 1256 Hywel, died 1268 Madog Fychan, died 1269 Angharad. Her father tried to marry her to Fulk, son of Marcher Lord Fulk FitzWarin.