 From then until his death Llywelyn was the dominant force in Wales, though there were further outbreaks of hostilities with marcher lords, particularly the Marshall family and Hubert de Burgh, and sometimes with the king.Llywelyn built up marriage alliances with several of the Marcher families.One daughter, Gwladus Ddu, ("Gwladus the Dark") was already married to Reginald de Braose of Brecon and Abergavenny, but with Reginald an unreliable ally Llywelyn married another daughter, Marared, to John de Braose of Gower, Reginald's nephew.