 Like the Black Falcons and Lion Knights/Crusaders, the Black Knights were in conflict with the Forestmen.The Lion Knights and Black Knights were featured together in only one set, the 1584 Knight's Challenge, and were merged into a "Castle" faction in 1990 and 1991 before being separated for 1992.As the 6059 Knights Stronghold and 6057 Sea Serpent featured the Black Falcons, this suggested that the two factions were rivals, particularly in Knights Stronghold where the Black Knights defend the gates against a Black Falcons siege.