the earldom's landholdings in the region were slowly broken up after william's son, roger de breteuil, rebelled against the crown in 1075. in 1135, a major welsh revolt took place, and in response king stephen restructured the landholdings along this section of the marches, bringing white castle and its sister fortifications of grosmont and skenfrith back under the control of the crown to form a lordship known as the "three castles".