Blackfyre is the fabled hand-and-a-half longsword of Valyrian steel once wielded by Aegon the Conqueror. It is the most famous of the several Valyrian swords once owned by House Targaryen,[1] and provided the name for House Blackfyre. Another known Valyrian blade owned by the family was Dark Sister, once wielded by Aegon's sister, Visenya.[2]