His grandson, [[Llewelyn ap Gruffydd]], was unable to resist a powerful invasion mounted by the English king [[Edward I]], and his death in battle in 1282 and the later execution of his brother Daffyd (executed for treason due to his betrayal of the English king, with whom he had previously been allied) marked the extinction of independent Wales. | His grandson, [[Llewelyn ap Gruffydd]], was unable to resist a powerful invasion mounted by the English king [[Edward I]], and his death in battle in 1282 and the later execution of his brother Daffyd (executed for treason due to his betrayal of the English king, with whom he had previously been allied) marked the extinction of independent Wales. |