Gwenllian Unknown Princess Powys Fadog was born to Ithel Fychan Unknown.
Madog ap Gruffydd Fychan "Crypl" Mathrafal Prince Powys Fadog 1275-1305 and Gwenllian Unknown Princess Powys Fadog were married. She by marriage Princess Powys Fadog. He the son of Gruffydd Fychan Mathrafal Prince Powys Fadog -1289.
[her son] Gruffydd Mathrafal was born to Madog ap Gruffydd Fychan "Crypl" Mathrafal Prince Powys Fadog 1275-1305 and Gwenllian Unknown Princess Powys Fadog.