To imprison them, keeping his elder brother, Owain Goch, within the castle’s prison for twenty-two years – a 50ft round tower which still dominates the site to this day.
Eu carcharu, gan gadw ei frawd hŷn, Owain Goch, yng ngharchar y castell am ddwy flynedd ar hugain – tŵr crwn 50 troedfedd sy'n dal i dra-arglwyddiaethu ar y safle hyd heddiw.