(in Orlando Furioso). A knight in Charlemagne's army, son of Olivero and Sigismunda. He was called black from his armour, and his brother Gryphon white. While Aquilant was searching for his brother he met Martano in Gryphon's armour, and took him bound to Damascus, where his brother was.
Source: Dictionary of Phrase and Fable, E. Cobham Brewer, 1894