sentences:  The bishop, however, was concerned that the lands of his nephews, the sons of his elder brother William, were not returned to them, and in May 1214 efforts to find a compromise with the king failed.John then confiscated some of the bishop's lands and granted them to another.This led Giles to join the barons opposing John, and in conjunction with the Welsh leader Llywelyn the Great, to raze Hugh de Mortimer's castle at Wigmore, Herefordshire.