History

Early in Era-1, when the Solar System was being settled, simple life was discovered on Jupiter's moon, Europa.  Beneath the surface ice there was a tidally warmed sea, and a research station was set up to study it.  

Next the Planetary League decided to terraform Ganymede and Callisto using precisely planned asteroid and comet impacts.  Through careful tending, these moons became habitable, and acted as a forward base for further exploration.  Io, being highly geologically active, was deemed too unstable for terraforming, but a few small outposts and mining operations did spring up there.  Due to the hazards of mining on Io, the Tardigrades were founded, as a search and rescue operation.

Ganymede became the capitol of the Jovian system, and Callisto became the commercial center.  Both Ganymede and Callisto had significant agriculture to support themselves and the other moons.  Most industrial operations were carried out in space colonies, or on the smaller moons. 

Jupiter's smaller moons were mined for raw materials, and a group of thriving colonies emerged.   

Over time, Jupiter's moons attracted members of the Steampunk community, and the area became known as the Clockwork Empire.  Although the Jovian colonies remained a part of the Planetary League, they developed a strong local culture that resembled a more fantastical version of Victorian England.

During the Great Reckoning, the Jovian system was captured by the Holy Empire of Man.  The resistance was significant, but the HEM had vastly superior numbers.  During Era-2, the moons of Jupiter became a manufacturing center for the HEM.

During the War of the Gods, the Jovian moons rose up and joined with the forces of Troniac, due to the largely robotic workforce that worked there.  

In Era-3, the moons of Jupiter became part of the Galactic Republic by popular vote.