(in Orlando Furioso). Ferraute, Ferracute, or Ferragus, a Saracen, son of Lanfusa. He dropped his helmet in the river, and vowed he would never wear another till he had won that worn by Orlando. Orlando slew him with a wound in the navel, his only vulnerable part.
Source: Dictionary of Phrase and Fable, E. Cobham Brewer, 1894