The titles Baron of Glyndyfrdwy and Lord of Cynllaith Owain were used by the dispossessed former ruling family of Powys Fadog before Owain was proclaimed Prince of Wales in 1400.
The titles Baron of Glyndyfrdwy and Lord of Cynllaith Owain were utilized by the ousted former ruling family of Powys Fadog prior to Owain being declared Prince of Wales in 1400.