BattleTech eras

Catalyst Game Labs, the current owners of BattleTech, have divided history into six eras. The products they released are grouped in this manner. Recently newer products have included other distinct time periods which brings the classification up to eleven eras:

Era	Years	Description	Symbol
Pre-Spaceflight	Up to 1950	Earliest referred to era, where humanity resides only on its planet of origin Terra.
Early Spaceflight	1950 – 2108	The time of the Western Alliance, early Terran Alliance and earliest interstellar colonies.
First Exodus	2108 – 2242	The early Terran Alliance era. The Outer Reaches Rebellion results in Demarcation Declaration, the forced independence for most colonies.
Second Exodus	2242 – 2398	Colonists on marginal worlds resettle or perish. The Terran Alliance collapses; the beginnings of the Terran Hegemony and the Great Houses of the Inner Sphere.
Age of War	2569 – 2569	The time of the Terran Hegemony, and "civilized" warfare between the Inner Sphere houses. The first BattleMech is created.
Star League	2570 - 2784	The time when the Star League reached the height of its power and was destroyed by the Amaris Coup.
Succession Wars	2785 – 3049	When the Great Houses vied for supremacy and many of the advances of the Star League disappeared as LosTech.
Clan Invasion	3050 – 3061	The time between the beginning of the Clan Invasion and the Inner Sphere's victory at the Great Refusal.
Civil War	3062 – 3066	The years in the shadow of the Federated Commonwealth Civil War.
Jihad	3067 – 3081	The time when the Word of Blake unleashed its Jihad.
Dark Age	3082 –	The time since the defeat of the Blakists and the creation of The Republic of the Sphere. This era includes events since 3132, when WizKids relaunched the BattleTech line as MechWarrior: Dark Age.

Bibliography

• The Periphery
• Strategic Operations