Walter 's first marriage proved barren .
Walter married Margaret , the daughter of Prince Llywelyn ab Iorwerth , late in life during 1232 following the accidental death of her first husband , John de Braose .
Walter 's first marriage proved barren and he married Margaret , the daughter of Prince Llywelyn ab Iorwerth , late in life during 1232 following the accidental death of her first husband , John de Braose .