Madog Fychan was a member of the family of Princes of Powys Fadog, though he never gained the title, being brother of Gruffydd Maelor II. He was an ally to Dafydd ap Llywelyn in his campaign to attack English possessions in Wales in 1245 and sided with Llywelyn ap Gruffydd in 1258 in his claim to the title of Prince of Wales. He died in December 1269.