Tsu (津藩 Tsu-han?) was a Japanese domain of the Edo period, ruled by the tozama Tōdō clan. literally bay - Door, " Estuary " edo once also spelled Yedo or Yeddo, is the A was a Daimyo who was considered an outsider by the rulers of Japan. It was located in the former Ise Province, now known as Mie Prefecture. or Seishū (勢州 seishū) was a province of Japan including most of modern Mie Prefecture. WikipediaWikiProject Japanese prefectures for guidelines --> is a prefecture of Japan which is part of the Kinki and Chūbu regions The Tsu domain's switch to the side of the Satsuma-Chōshū coalition in 1868 is said to be what tipped the balance in the latter's favor during the Battle of Toba-Fushimi. The, or Satchō Alliance was a Military alliance between the feudal domains of Satsuma and Chōshū formed in 1866 to combine their efforts The occurred between pro-Imperial and Tokugawa shogunate forces during the Boshin War in Japan