Khitomer

Khitomer was a planet in the Klingon Empire, near the border with the United Federation of Planets.

Khitomer was the site of a peace conference convened in 2293 between the Klingons and the Federation]]. As a result of this conference, the Khitomer Accords were drafted, creating an alliance between the two powers. (movie: Star Trek VI: The Undiscovered Country)

The Klingon settlement on Khitomer was attacked in 2346. Among the victims was Mogh. (TNG episode: "Sins of the Father")

Khitomer was the site of a summit in 2376 among the allies of the Dominion War. (novel: The Brave and the Bold)