The 9th century is defined by the calendar of Earth as occurring from the year 801 through the year 900.
Statue depicting the struggle between Kahless and Molor*Kahless the Unforgettable unites the Klingon people after his defeat of the tyrant Molor and the Fek'Ihri. Kahless establishes a strict warrior code that is passed down through Klingon culture to the present day. (TNG: "Rightful Heir"; DS9: "The Sword of Kahless")
- The Nacene expedition reaches the Milky Way Galaxy. (VOY: "Cold Fire")
- A ferocious war breaks out on Solais V. The conflict lasts until the 24th century, at which point both sides are nearly wiped out. (TNG: "Loud As A Whisper")
- The society on Kaelon II first adopts the custom of the Resolution. (TNG: "Half a Life")
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