The High History of the Holy Graal

-Originally written in Old French, sometime in the early half of the 13th Century A.D., as a continuation of Chrétien de Troyes' unfinished work "Perceval, or the Knight of the Grail":

Here the story is silent of Lancelot and Messire Gawain, and saith that Perceval is in the Turning Castle, whereof Joseus recounteth the truth, to wit, that Virgil founded it in the air by his wisdom in such fashion, when the philosophers went on the Quest of the Earthly Paradise, and it was prophesied that the castle should not cease turning until such time as the Knight should come thither that should have a head of gold, the look of a lion, a heart of steel, the navel of a virgin maiden, conditions without wickedness, the valour of a man and faith and belief of God...