E. Cobham Brewer 18101897. Dictionary of Phrase and Fable. 1898.
Orgoglio (pron. Or-gole-yo).
The word is Italian, and means Arrogant Pride, or The Man of Sin. A hideous giant as tall as three men; he was son of Earth and Wind. Finding the Red Cross Knight at the fountain of Idleness, he beats him with a club and makes him his slave. Una, hearing of these mischances, tells King Arthur, and Arthur liberates the knight and slays the giant. Moral: The Man of Sin had power given him to make war with the saints and to overcome them for forty and two months (Rev. xiii. 5, 7), then the Ancient of Days came, and overcame him (Dan. vii. 21, 22). (Spenser: Faërie Queene, book i.)
Arthur first cut off Orgoglios left armi.e. Bohemia was first cut off from the Church of Rome. He then cut off the giants right legi.e. England; and, this being cut off, the giant fell to the earth, and was afterwards dispatched.