The Kot'baval Festival is a Klingon celebration where the people honor Kahless the Unforgettable's defeat of the tyrant Molor in single combat using his mighty Bat'leth. That bat'leth is known as the legendary Sword of Kahless. (TNG episode: "Firstborn")

In the mirror universe, the Kot'baval Festival celebrated the victory of Molor the Unforgettable over Kahless. (ST novel: Dark Passions)

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