Ujisato died of illness at the age of 39, and Toyotomi Hideyoshi reassigned his vast domain to
Uesugi Kagekatsu, whom he relocated from
Echigo Province. Although Tsuruga Castle was already large, Uesugi Kagekatsu started to build another castle on the outskirts of Aizuwakamatsu town, but it was never completed. After having sided with the
Toyotomi clan during the
Sekigahara campaign, the Uesugi Clan was demoted in status and relocated to a much reduced
Yonezawa Domain. The domain was then assigned to
Katō Yoshiaki, who was noted for his bravery at the
Battle of Shizugatake. Under the Katō, the castle was reformed and a new layout was imposed on the surrounding
jōkamachi. However, during a great earthquake in 1611, the castle was severely damaged, and the
tenshu was rebuilt into the current configuration. The Katō were dispossessed in 1643 and were replaced by
Hoshina Masayuki, the illegitimate son of
Shōgun Tokugawa Hidetada and thus half-brother of
Tokugawa Iemitsu. He later served a regent to the underage Shōgun
Tokugawa Ietsuna. Within Aizu, he developed commerce and agriculture, and established
han school, the
Nisshinkan. His successors were permitted to take the "Matsudaira" surname. Throughout the
Edo period, Aizu Domain was an important
Tokugawa stronghold in the
Tōhoku region and was one of the strongest domains in terms of its military power. During the
Bakumatsu period,
Matsudaira Katamori was one of the Shōgunate's most able and loyalist supporters. After the defeat of the Shōgunate at the
Battle of Toba–Fushimi and the abdication of power by Shōgun
Tokugawa Yoshinobu, Matsudaira become one of the leaders in the pro-Tokugawa alliance against the new
Meiji government. During the
Battle of Aizu in the
Boshin War, Tsuruga Castle was besieged by the forces of the
Satchō Alliance in October 1868. Although the castle was very strong by traditional standards, the new government army was equipped with western artillery, which was able to shell the castle from surrounding hills for over a month. Faced with the inevitable eventual defeat, Matsudaira surrendered the castle and his remaining forces in November. The surviving castle buildings, pockmarked by artillery during the siege and structurally unstable, were demolished by the new government in 1874. One
yagura survived the destruction by being relocated to a Buddhist temple, Amida-ji, five-kilometers from the castle. The castle site was mostly sold off to private landowners, with only the central portion (23 hectares) kept by the government for use by an
Imperial Japanese Army garrison until 1908. This area forms the core of the modern National Historic Site. With the popularity of the
Byakkotai story in pre-war Japan, a movement arose to preserve the site of the castle, and it was made into a public park. The National Historic Site status was granted in 1934, although the area still suffered from indignities, such as a
velodrome operating in the
inner bailey until 1957. In 1965, a reconstruction of the
tenshu in concrete was completed as a symbol of the city. Currently there is a museum inside, and an observation gallery on top with panoramic views of the city. A gate was completed at the same time. In 1991, a
yagura and a connecting corridor were also reconstructed. The tea room, named Rinkaku, has been restored and is designated as a Fukushima Prefecture Important Cultural Property. It is open to the public, and at times tea ceremonies are held there. ==Layout==