Founded in 2317 by Lucien Davion, then Prime Minister of New Avalon. A member of the Davion family has led the Federated Suns for over 700 years.

The Federated Suns is one of the largest and most powerful of the Successor States. Along with the Draconis Combine, it stands as a dominant influence in the politics and military strategies of the 31st century. Indeed, few objectiv observers dispute the fact that these 2 interstellar states are most likely of all the Successor powers to achieve the elusive goal of reunification of the Inner Sphere, which has been at the root of the seemingly endless wars of the modern era.

The Federated Suns is the largest alliance in the Inner Sphere, comprising over 500 inhabited star systems spread out over some 20,000 square parsecs of space, and is this size that gives House Davion preeminence in Human-occupied space. Beginning as a loose association of 20 worlds just over 700 years ago, it has been one of the most stable political bodies in explored space. Although occasionally plagued by internal disruptions, and often easily involved in wars with its 2 neigbhoring states—the Draconis Combine and the Capellan Confederation—the Federated Suns has managed to grow and prosper through most of its long and eventful history. Yet, no other Successor State has been as badly hurt by the loss of technology during the Succession Wars. In some ways, its economic condition might summed up a few overdeveloped worlds in a underdeveloped realm. The Davion government has, therfore, placed a high priority on the scientific research, which may spell trouble for Comstar in the future.

Of all the Successors States, the Federated Suns makes the most of "keeping alive the principles of democracy" and "promoting the cause of personal freedoms," and takes a highly view of the matter. Prince hance Davion, believes that whether a government is "free" or "totalitarian", it must spend about the same amount of energy to maintain order, either by taking pains to protect its citizens' rights or by creating agencies to suppress those rights. Prince Davion reasons that there is more to be gained in loyalty and patriotism by protecting the peoples' rights then opressing them. However, Draconis Combine is more evil because it is generally perceived as a brutal, repressive police state than the Federated Suns' image automatically makes it "good". Like all Human endeavours, the Federated Suns has its strenghts and weaknesses, and owes much of what it is now to the political and social evolution that is History in action.

What the future holds for the Federated Suns depends on its recent alliance with House Steiner's Lyran Commonwealth, whose economic power is a perfect complement to Davion's military might. Though some believe that this alliance may be the first step toward reunification of the Inner Sphere, or at least the establishment of a new Star League, it is far too early to tell. The biggest obstacle is that the other three powers of the Inner Sphere banded together in an alliance of their own almost before the ink was dry on the Steiner-Davion Pact.

Hanse Davion became the ruler of House Davion and the Federated Suns after his older brother Ian died in the battle of Mallory's World. At 42, he is the younguest of the five Successors Lords. Enemies and friends alike call him The Fox, and his reputation for carefully crafted intrigue is well-deserved. In particular, it is believed that his agents are responsible for several of the rebellions that have plagued the House of Marik in recent years.

The main threat to Hanse Davion's position comes from the ambition of his brother-in-law, Michael Hasek-Davion, Duke of New Syrtis. The Duke commands a large number of troops, and he has grown increasingly restive under the authorithy of the young Prince. There are rumors that he has concluded a treasonable pact with Maximillian Liao, ruler of the Capellan Confederation.