Sent by Sayaka who lives in Kōchi Prefecture, Japan.
Kōchi Castle (高知城, Kōchi-jō) is an Edo Period Japanese castle in the city of Kōchi, Kōchi Prefecture, Japan. It is located at Otakayama hill, at the center of Kōchi city, which in turn is located at the center of the Kōchi Plain, the most prosperous area of former Tosa Province on the island of Shikoku. From 1601 to 1871, it was the center of Tosa Domain, ruled by the tozama Yamauchi clan under the Tokugawa Shogunate. The castle site has been protected as a National Historic Site since 1959, with the area under protection expanded in 2014.
During the Sengoku period, Tosa Province was dominated by Chōsokabe Motochika, who conquered most of Shikoku from stronghold at Okō Castle. However, Okō Castle was a mountain stronghold with little room for the development of a castle town. After his defeat by Toyotomi Hideyoshi in 1585, Motochika decided to construct a new castle at Otakayama hill and the ruins of an ancient fortification which had been constructed by Otakasa Matsuomaru sometime during the late Heian or Kamakura period. Although the new castle had the advantages of space and a central location, the area around the hill at this time was extremely swampy, due to the influx of alluvial sediments from the Kagami River, and was prone to flooding. Motochika shortly afterwards moved once again to a new location at Urado Castle on the coast, which also had the advantage of being closer to his fleet (read more).
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