Which knight betrayed King Arthur what did he do?

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Lancelot betrayed King Arthur by having an affair with his wife, Guinevere.

Another well known knight to betrey arthur was Mordred, Mordred is known to be worse be cuase he actually landed a mortal wound which ended up killing arthur

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How did King Arthur get betrayed?  Was modred a knight of King Arthur?  How do you be a knight of king arthur?  Which knight is the loyalist to King Arthur?  What was the name of the knight that planned to plot king Aurthur?