The ancient Klingon stronghold whose Great Hall Kahless and Lukara defended alone against five hundred of Molor's warriors, an event celebrated in a famous opera.
Qam-Chee is a place in Klingon legend, described in the Deep Space Nine episode Looking for par'Mach in All the Wrong Places.
According to the story, Molor's troops stormed the Great Hall at Qam-Chee and the garrison fled. Only Kahless and the Lady Lukara stayed, fighting side by side against five hundred enemies. When the battle was won they fell into each other's arms, and their romance became the greatest in Klingon lore.
In 2373 Worf helps Quark to woo Grilka with a holosuite re-enactment of the battle, and Jadzia Dax plays Lukara. The tale ends up bringing Worf and Dax together as well.