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Aizu (会津) is a region in northeast Japan.
In the Edo period, Aizu was a feudal domain in the Tokugawa shogunate and the setting for one of the most important battles of the Boshin War, the Battle of Aizu. The daimyo of this feudal domain was Matsudaira Katamori, the Tokugawa Shugoshoku of Kyoto. Aizu was also the birthplace of Japanese Assassins Nakano Takeko and Shiba Atsuko, who fought in the Boshin War to stop the Templars from restoring the authority of the Imperial Court.