Lakarian City

From Memory Alpha, the free Star Trek reference

Lakarian City was a major city on Cardassia Prime. Its leisure facilities included an amusement center - one which Gul Dukat had been planning to take his son, Mekor, to for his eleventh birthday in 2371. (DS9: "Defiant")

In 2375, following the Cardassian Rebellion's sabotage of the planet's power systems, which caused a planet-wide blackout, the city was leveled by Jem'Hadar troops, on the order of the Founder in command on the planet. All two million inhabitants were killed. This action provoked the defection of the Cardassian military, and a planetary revolt, ultimately turning the tide of the Battle of Cardassia.

When Ekoor and his Cardassian troops turned on their Jem'Hadar allies and killed them several hours later, Ekoor said "that's for Lakarian City". (DS9: "What You Leave Behind")