A haughty giant who encountered the Red Cross Knight with the witch Duessa. Orgoglio made the Red Cross Knight his slave and Duessa his mistress.
Una, the Red Cross Knight’s amie, learned of his plight and found help from Prince Arthur. Arthur stormed Orgoglio’s castle and slew him, freeing the Red Cross Knight.
Source
The Faerie Queene | Edmund Spenser, 1570-1599