After slaying the tyrant Molor using the first bat'leth, Kahless the Unforgettable founds the First Empire, becoming its first emperor.
Klingon Timeline
Timeline from Klingon point of view.
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900
999
Time of Kahless
Political event -
2016
Vulcan - Klingon First Contact
Political event -
2151
3
Unofficial: Klingon - Human First Contact
Political eventThe Klaang incident with the Suliban at Broken Bow, Oklahoma on Earth.
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2256
2257
Klingon-Federation War (2256-57)
Military: War -
2257
End of Federation-Klingon War (2256-57)
Military: WarFederation officer, Commander Saru leads the USS Discovery on a mission that results in the end of the Federation-Klingon War
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2357
1st Klingon to join Starfleet
Life, Career -
2367
31 /3
K'mpeck dies
Political event -
2369
Kahless Re-appearance
Religious eventKahless was created by clerics from Boreth. He is now has a purely representative, position of Klingon emperor, while Gowron remained the Empire's Chancellor and factual leader.
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2372
Invasion of Cadassian Space
Military: WarLed by Martok the Klingon Empire starts an invasion of the Cardassian Union
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2373
2375
Dominion War
Military: War -
2373
Martock Changeling Death
Political eventAt the Order of the Batleth Ceremony a Changeling was discovered in disguise as General Martock and then killed.