That is Aizu domain. According to the guy further up this thread they have a bonus to traditional Samurai type things, starting East of where Uesegi start in Shogun 2. In the 17th century they developed close ties for the Shogun and the Daimyo set down a house code declaring single minded devotion to the Shogun. They were the head of the Shinsengumi (Shoguns secret police). Maybe they'll have some bonus because of that?
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