His power and his victories, including the battles of Gwen Ystrad and Alt Clut Ford, are celebrated in the praise poems to him by Taliesin, preserved in the Book of Taliesin.
O seu poder e as súas vitorias, incluídas as batallas de Gwen Ystrad e Alt Clut Ford, son celebradas nos poemas laudatorios que lle dedicou Taliesin, preservados no Libro de Taliesin.