Manwgan ap Selyf was an early 7th-century King of Powys, the son of Selyf Sarffgadau.
One theory asserts that when Manwgan ap Selyf came to the throne in 613 he was a young boy, which led to an invasion of Powys by Eluadd ap Glast (alias Eiludd Powys), the erstwhile King of Dogfeiling. The usurper probably managed to hold the throne for some thirty years or more before he was killed fighting the Northumbrians, possibly at the Battle of Maes Cogwy, traditionally identified as Oswestry, in 642. The Dogfeiling dynasty was finally crushed by the Saxons around 656, and Manwgan was able to take his rightful place on the Powysian throne. However Eiludd is unlikely to be the same as Eluadd ap Glast as Eiludd is recorded as the brother of Manwgan and son of Selyf in Jesus College, Oxford MS. 20, whereas in the British Library Harley MS 3859 he is Manwgan's uncle and a brother of Selyf.
Dunoding Dunod ap Cunedda Eifion ap Dunod Dingad ab Eifion Meurig ad Dingad Eifion ap Meurig Issac ap Eifion ap Meurig Pobien Hen ap Isaac Pobddelw ap Pobien Hen Eifion ap Pobddelw Brochwel ap Eifion Eigion ap Brochwel ab Eifion Ieuanawl ab Eigion Caradog ap Ieuanawl Bleiddud ap Caradog Cuhelyn ap Bleiddud
Kingdom of Ceredigion Ceredig ap Cunedda Usai ap Ceredig Serwyl ab Usai Boddw ap Serwyl Arthfoddw ap Boddw Athrwys ab Arthfoddw Clydog ab Athrwys
Seisyllwg Seisyll ap Clydog Arthen ap Seisyll Dyfnwallon ab Arthen Meurig ap Dyfnwallon Gwgon ap Meurig
Dyfed Tewdos (Tewdwr) Maredudd ap Tewdws Rhain ap Maredudd Owain ap Maredudd Triffyn ap Rhain Bleddri (Bledrig) Hyfaidd ap Bleddri Llywarch ap Hyfaidd Rhodri ap HyfaiddHywel Dda
Brycheiniog
745–825
Glywysing Rhys ab Ithel Rhodri ab Ithel Meurig ab Ithel Rhys ap Arthfael Hywel ap Rhys Owain ap Hywel
Gwent Brochfael ap Meurig Ffernfael ap Meurig Brochwel ap Meurig Arthfael ap Hywel Ithel ab Athrwys ap Ffernfael