Second Frontier War (615 to 620)

Fought between the Outworld Coalition and the Imperium during the period of the barracks emperors.  Arbellatra (587 to 666) was named Grand Admiral of the Marches by Cleon V and led the combined local and Imperial forces to defeat the Coalition, and then he proceeded to reestablish the central Imperial authority.  She was named regent in 622 as a result, and Empress in 629.

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