Byrne City was the capital city of Demophon. Located on the continent Junno, Byrne City was domed to protect its denizens from Demophon's fierce atmosphere. The city was connected to Demophon's other major cities through a series of underground tunnels that allowed those fleeing the unstoppable destruction of the planet to arrive at the planet's primary spaceport, Byrneport. The city was destroyed along with Demophon when the system's star went nova.