Inner Sphere

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The Inner Sphere is an region in the BattleTech universe comprised of the space within about 500 Light Years from Terra. It is home to some 2000 inhabited star systems and is the core of human inhabited space. This is on contract to The Periphery and is home to the Five Great Houses, known as the Successor States after the Amaris Civil War, and mankind’s homeworld of Terra that was/is the capital of the Star League and the Terran Hegemony before the latter two collapsed.

The Great Houses

Between the time of the Terran Alliance’s collapse and the formation of the Star League, the majority of political and industrial entities switched from democratic and meritocratic governance to hereditary and technocratic decision making. The fact many planets were also cut off from their capitals in terms of speedy communication until the advent of the HPG (which replaced the more limited KF JumpShip Pony Express) made autonomous feudalism a defining feature in societal hierarchy. You definitely had national rulers who can dismiss or executed treasonous planetary governors at will but they couldn’t be everywhere at once and had to delegate. Out of the multiple Noble Houses that emerged, a handful stuck out in terms of how long they have lasted and how much power they possess.

Successor States

• House Davion
• House Kurita
• House Liao
• House Marik
• House Steiner

Historical Houses

• House Cameron
• House Marsden

Powers in the Inner Sphere

The biggest players in the Inner Sphere are the Five Successor States.

• Capellan Confederation
• Draconis Combine
• Federated Suns
• Free Worlds League
• Lyran Commonwealth

But besides them, there's also

• Free Rasalhague Republic
• ComStar
• The Clans After 3050.
• Word of Blake, much to everyone else's Regret.