Gruffydd ap Madog Fychan
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Gruffydd ap Madog Fychan was according to some sources the son of Madog Fychan the hereditary prince of Powys Fadog between 1304-c.1325. It seems unlikely that Gruffydd ever inherited the throne and may have died before his father. His son, Gruffydd Fychan II appears to have inherited the titles Lord of Glyndyfrdwy and Cynllaith Owain directly from Madog Fychan sometime around 1325.