As such, he had a claim to be hereditary Prince of Powys Fadog,[1]: 134 and was a member of the Royal House of Mathrafal.
[2][3] He was the grandson of Lord Madog Crypl of Powys Fadog, son of Prince Gruffudd Fychan I.
[4][2][3] His father and grandfather were the Barons of Glyndyfrdwy and Cynllaith Owain in Powys Fadog, once held in its entirety by his ancestor, Prince Gruffydd Maelor II.
Her father's cousins included Eleanor (died 1332), who married to Rudolph, Duke of Lorraine, son of Elisabeth of Habsburg, and Beatrice, who married to Imperial vicar Guido Gonzaga, Lord of Mantua, member of the Princely House of Gonzaga.
[17] He was buried at the Church of St. Asaph & St Cyndeyrn in Llanasa where the remains of his tomb can be seen today.