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A friendly reminder regarding spoilers! As always, the expanded Trek universe is in a period of major upheaval with the continuations of Strange New Worlds and Prodigy, the advent of new eras in gaming with the Star Trek Adventures RPG and Star Trek Online, as well as other eventful releases such as Section 31, the ongoing IDW Star Trek comic and spin-off Star Trek: Defiant. Therefore, please be courteous to other users who may not be aware of current developments by using the {{spoiler}}, {{spoilers}} OR {{majorspoiler}} tags when adding new information from sources less than six months old (even if it is minor info). Also, please do not include details in the summary bar when editing pages and do not anticipate making additions relating to sources not yet in release. THANK YOU

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Memory Beta, non-canon Star Trek Wiki

The Imperial Senate was a legislature that existed within the Terran Empire of the mirror universe. It served as a counterbalance to the power held by the Emperor though a great many rulers arose from the ranks of the Senate itself. Those that walked its corridors were given the opportunity to form the adequate allegiances needed to bring about a claim for the throne itself. (Decipher RPG module: Through a Glass, Darkly)

Christopher Pike was an Imperial Senator. (TOS comics: "Mirrored, Part 1", "Mirrored, Part 2")

In 2278, the Senate elected Spock to a five year term as the Commander in Chief of the Terran Empire. (TOS novel: Spectre)