Mambrino, a Moorish king, celebrated in the romances of chivalry, who possessed a helmet of pure gold which rendered the wearer of it invulnerable, the possession of which was the ambition of all the paladins of Charlemagne, and which was carried off by Rinaldo, who slew the original owner; Cervantes makes his hero persuade himself that he has found it in a barber's brass basin.