Collier's New Encyclopedia (1921)/Norham Castle
NORHAM CASTLE, the border fortress of the bishops of Durham; on the Tweed river; 8 miles S. W. of Berwick. Founded in 1121, and deemed impregnable in 1522, it has memories of Kings John, Edward I., and James IV., but is known best through “Marmion.” The picturesque ruins comprise a great square keep, 70 feet high.