Assertion: questing beast | /r/CapableOf | appear to young king arthur
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text: The Post-Vulgate's account, which was taken up by Thomas Malory for his seminal Le Morte d'Arthur, has the Questing Beast appear to the young King Arthur after he has had an affair with his half-sister Morgause and begotten Mordred (they did not know that they were related when the incestuous act occurred).