The original Norham Castle dates from 1120, when it was constructed by Flambard, Bishop of Durham.  It was destroyed 20 years later by the Scots, and was rebuilt after 1158 by the Prince-Bishop of Durham.  The castle stands impressively on a bend in the River Tweed, at one time the boundary between Scotland and England.  It was described by Sir Walter Scott in "Marmion" as "The most dangerous place in England".