Old Caerlaverock Castle is an early 13th century square stone enclosure fortress, founded by Sir John Maxwell. A two storey chamber block, with an external stair was built in the east corner, of the large moated platform. The cobbled courtyard was encased by a curtain wall, which soon started to subside and had to be strengthened by substantial square corner towers. Also standing on the south side the enceinte, were stone building ranges and a ground-floor hall, with a timber building in the north corner. After only fifty years, it was abandoned and its successor Caerlaverock Castle built. To the south of the castles is a flat-bottomed basin, which is presumed to have been a contemporary harbour. 3 miles north-east is Cockpool Castle.