The Black Knights were one of the various factions of LEGO's Castle theme and were introduced in 1988. During its run, a total of thirteen sets were released as part this series, including two major castles, making it one of the larger LEGO Castle factions of this era. The black colour of their fortifications was one of the features that set the Black Knights apart from earlier factions. The Black Knights were also distinguished by their symbol, which was a blue wyvern dragon featured on their shields and banners, a motif that was also used by the Dragon Masters with different colours. The Black Knights were phased out as regular theme after 1994 but the crest still made occasional appearances until 1996.