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In the mirror universe, the Supreme Regent of Vulcan was responsible for governing the planet Vulcan. The Regent also served as an advisor to the Emperor of the Terran Empire.
In 2155, T'Pol became the first Regent when Empress Hoshi Sato appointed her to the office as a result of Vulcan's growing autonomy within the Terran Empire. (ENT - Mirror Universe novel: Age of the Empress)
T'Pol still held that position in 2165. (ENT - Mirror Universe short story: "Nobunaga")