E. Cobham Brewer 18101897. Dictionary of Phrase and Fable. 1898.
Orilo or Orillo (in Orlando Furioso, book viii.).
A magician and robber who lived at the mouth of the Nile. He was the son of an imp and fairy. When any limb was lopped off he restored it by his magic power, and when his head was cut off he put it on his neck again. Astolpho encountered him, cut off his head, and fled with it. Orillo mounted his horse and gave chase. Meanwhile Astolpho with his sword cut the hair from the head. Life was in one particular hair, and as soon as that was severed the head died, and the magicians body fell lifeless.