The City of the Thousand Lights was the capital city of the Traveler's homeworld. It, like the rest of the planet, was conquered by Niklon.
History[]
In 2265, when the Traveler returned to his world and learned what had happened, he, James T. Kirk, Spock and Leonard McCoy traveled to the City of the Thousand Lights and tried to enter the government seat, but they were captured by Niklon's robot guards and imprisoned. After escaping from their cell, they confronted Niklon and defeated him in battle. (TOS comic: "Dark Traveler")