Notes for Owen ap Griffith Prince of Upper Powys
Bartrum on his table “Bleddyn ap Cynfyn 30” shows that he was born in 1274 and died in 1293, quoting Eyton vi 61.
CP refers to him as being a ‘feudal baron’ from 1286. As well as naming him as Owen ap Griffith ap Gwenweynweyn, CP also says he used De la Pole which means of Welshpool.