Thyrm

Thyrm, aka the Original #SwagCity, is an impressively swag Deron city located on the already very swag moon Iapetus, which orbits Saturn. It was the capital of the Byzantine for a few marins before Deron became too good for the Milky Way Galaxy. It's still supremely pro, but it now has challengers in the form of Byzantium II and Spectrum City. Deron also shared Thyrm with Hafnion for a while until they left for the Mallux Galaxy.

So why is Thyrm so swag?
Deron + Iapetus. Nuff said. (Also, Elise said so, and she's the master of the word "Swag".)