 In the 1550s , Bishop Barlow sold the lead from the roofs of the great hall . This resulted in it falling into a ruined state . It can be seen in an engraving of 1733 but was largely demolished around 1830 by Bishop Law . He created a " more picturesque ruin " by removing the south and east walls and laying out and planting the area previously occupied by the great hall . The palace was used as a garrison for troops in both the English Civil War and Monmouth Rebellion after which it was used as a prison for rebels after the Battle of Sedgemoor . 
