There was another Dragon Knights castle?! 1906 Majisto's Tower is one of those wonderfully terrible mid 90's sets that Lego threw together from over produced parts and seemingly only released in America (
Kingdoms - Dragon Knight Armor with Chain, Helmet with Visor, Beard - Lego Castle Minifigures
LEGO minifigure cas525 - Castle - Dragon Knight Scale Mail with Dragon Shield and Shoulder Armor, Helmet with Neck Protector, Dark Gray Beard at BrickScout