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. 

The Klingon settlement on Khitomer was attacked in 2346. Many of the inhabitants of the colony died, including Worf's parents Mogh and Kaasin. Ja'Rod, the father of Duras, was also killed in the attack. A number of other Klingons were captured by the Romulans during the attack. 

Eventually the settlement at Khitomer was rebuilt. It would serve as the site of a summit in 2376 among the allies of the Dominion War. 

Though saved from the Borg once, this planet was again atacked and fell to the Borg Invasion of 2381.