The clone of Kahless (2369)
The clone of Kahless the Unforgettable was created by the clerics of Boreth in 2369 using DNA from the Knife of Kirom. The clerics wished to give the impression it was the real Kahless, who had returned from Sto-vo-kor to once again lead his people. When Worf visited the planet Boreth, the clone of Kahless appeared to him. Worf believed that the real Kahless had returned. Kahless and Worf spoke of a new direction for the Klingon people, but Worf began to doubt that the clone was the real Kahless, because he could not remember the taste of warnog, or what existence is like in Sto-vo-kor. Kahless was challenged to combat by Gowron, and was defeated, raising more doubts. In light of this, the clerics finally admitted their fraud. Worf thereby suggested that the clone of Kahless be made Emperor of the Klingon Empire. However, Gowron would continue to run the Klingon High Council. The clone of Kahless accepted and became the moral leader of the Klingon people. He then told Worf that what mattered was Kahless' words and teachings, not the man himself. (TNG: "Rightful Heir")
Emperor Kahless refused to talk with Lieutenant Commander Worf when he investigated the reason that a large Klingon fleet was docked at Deep Space 9 in 2372. Kahless' lack of power as emperor became evident several days later when the fleet launched an invasion of the Cardassian Union. Emperor Kahless condemned the invasion but was overruled by Gowron. (DS9: "The Way of the Warrior", "The Sword of Kahless")
Emperor Kahless was present in the Great Hall when Kurn was dismissed from the High Council soon after. (DS9: "Sons of Mogh")
Kor was unwilling to bring the Sword of Kahless to Emperor Kahless when he, Worf and Jadzia Dax discovered it in the Gamma Quadrant in 2372. Worf had hoped Kahless would use the Sword against Gowron. Kor however, felt Kahless was a "toothless figurehead" and a pretender to the throne. (DS9: "The Sword of Kahless")
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Apocrypha
Emperor Kahless appears in The Left Hand of Destiny novels and the final Star Trek: A Time to... novels. In J.G. Hertzler and Jeffrey Lang's novels, Kahless helps Chancellor Martok to regain his position after a coup d'état against the Klingon leader. Kahless himself was believed to have been killed after fighting Hur'q soldiers on Boreth, although it is later revealed he survived. He stands down as Emperor, as he felt Martok's accomplishments had made him irrelevant. In the book Kahless, it explores the myths behind the Unforgettable One. It goes into detail about how Morath was the honorable Klingon behind the revolt against Molor. It goes farther on to say that the blood on the knife that cloned Kahless was actually Morath's. That means that the clone of Kahless is really the clone of Morath.