History of the Inner Sphere

Early Colonization

Formation of the Great Houses

Colonization of the Inner Sphere began in 2108 when the Terran Alliance launched the first manned faster-than-light mission. Between 2108 and 2235, the Terran Alliance colonized and ruled the first centralized interstellar government in human history, controlling more than 600 colonies within 120 light years of Terra. From c. A.D. 2300 to 2787, the Inner Sphere was divided into five “pie wedges” around a central, roughly circular core.

  • The Free Worlds League, established 2271
    • Rulers: House Marik
  • The Federated Suns, established 2317
    • Rulers: House Davion
  • The Draconis Combine, established 2319
    • Rulers: House Kurita
  • The Lyran Commonwealth, established 2340
    • Rulers: House Steiner
  • The Capellan Confederation, established 2367
    • Rulers: House Liao
  • The central Terran Hegemony, established 2315
    • Rulers: House Cameron

The Star League

250 Years of Peace

Shortly after the formation of the Great Houses, the Age of War began. The end of the Age of War accompanied the formation of the Star League, a multinational administrative and peacekeeping treaty, which lasted for ~250 years. During the Star League, mankind achieved technological marvels. With the collapse of the Star League in 2781 and exodus of the Star League Defense Force from the Inner Sphere, the Great Houses consumed the moribund Hegemony and turned on to each other. Only Terra remained independent under the aegis of neutral interstellar communications agency, ComStar.

The Succession Wars

250 Years of War

During the next 250 years, civilization was hammered from its 28th Century peak down to 21st Century technology on many worlds and to more primitive states on others – and hundreds of worlds had their populations exterminated altogether. The cause for this warfare was a matter of feudal succession to the throne of the fallen Star League hence the four wars of this period were called Succession Wars, while the five Great Houses were said to rule Successor States.

Despite hundreds of billions of deaths, the first three Succession Wars resulted in little change to the map after the First Succession War divided the Terran Hegemony between the five Successor States. The brief Fourth Succession War brought a dramatic change when the Lyran Commonwealth and Federated Suns, on opposite sides of the Sphere, united at the expense of the other Successor States’ territories. A number of minor nations appeared in the Inner Sphere during or shortly after the Fourth Succession War, at the expense of the Free Worlds League and the Capellan Confederation.

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History of the Inner Sphere

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