Morgan le Fay wanted to kill King Arthur for revenge and due to their complicated relationship dynamics.
Morgan le Fay wanted to kill King Arthur not only to usurp his empire but also to avenge her father. In Arthurian legend, Morgan le Fay is often portrayed as a vengeful character seeking retribution for past wrongs. For example, in some versions of the legend, Morgan le Fay's actions are driven by a desire to seek revenge for perceived injustices against her family.Another reason for wanting to kill King Arthur may be tied to Morgan le Fay's complex relationship with him, which includes elements of jealousy, betrayal, and power struggles.
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A. She wanted to hurt Guinevere.
Morgan le Fay, King Arthur's sister, wanted to kill him for a number of reasons.
While she plots to take Arthur's place as ruler, she also wanted to kill him to hurt Guinevere. Morgan le fay was known to hate Arthur's wife, Guinevere, which began during the time she serves as the queen's lady-in-waiting.
While the origin of her hate varies due to different portrayals of Morgan le Fay, one of the portrayals states that the origin of her hate stems from when Guinevere made her nephew break up with Morgan, which caused Morgan to hate the queen for the rest of her life.
Morgan even once sent the Green Knight to Camelot in disguise to scare Guinevere to death.