 As William de Braose had no male heir, Llywelyn strategized that the vast de Braose holdings in south Wales would pass to the heir of Dafydd with Isabella.Gruffydd was given an appanage in Meirionnydd and Ardudwy but his rule was said to be oppressive, and in 1221 Llywelyn stripped him of these territories.In 1228, Llywelyn imprisoned him, and he was not released until 1234.