Calysto System
The Calysto system is the home system for The League of Allied Worlds. It was colonized as part of First Contact with the NorAellians.
The Calysto is a seven planet system that fairly unique for having two planets inside the "goldilocks zone", Calysto and Arcas. It has a large asteroid field on it's outer edge that is perfect for supplying raw materials to the manufacturing station Hephaestus.
Besides being the steat of government for the League, a large percentage of ship manufacturing happens at Hephaestus Station. The League's primary military leadership also resides in-system on Freedom Station.
(See: First Contact)
Calysto was the first system that Humanity ever colonized. The Perseverance Fleet was taken here by the NorAellians as a way of saving the otherwise ill-fated colonists. Calysto then became the focal point for the establishment of a new Human government, and allowed the League to establish itself as an interstellar power.