He also oversaw the first complete English translation of the French Vulgate and Post-Vulgate Cycles, released as the five-volume Lancelot-Grail: The Old French Arthurian Vulgate and Post-Vulgate in Translation.
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Ywain appears in all the cyclical accounts such as the Vulgate Cycle, the Post-Vulgate Cycle, and Malory's Le Morte d'Arthur as well as in numerous independent romances.