For 10 points, name this capital of the Byzantine Empire.
Homeowners in this city were granted a special bread ration called the  panes aedium . The large Baths of Zeuxippus in this city were damaged during a riot among different  demes . The dome at the center of this city, known as the  milion , contained an important relic retrieved from the Holy Land by Helena, arguably the first Christian pilgrim. The tops of the towers spaced 180 feet apart in this city's Walls of Theodosius were removed to house (*)  bodies during a devastating plague in 541 CE. Defenders in this city resorted to chaining the Golden Horn and deploying Greek Fire to repel a 10th century invasion. The Blues and Greens clashed in this city during the Nika Riots. For 10 points, name this capital of the Byzantine Empire.
Homeowners in this city were granted a special bread ration called the  panes aedium .
Constantinople  [or  Istanbul ; or  Byzantium ]