is the site of a castle structure in Shiroishi,

Saga Prefecture is a prefecture of Japan located on the island of Kyushu. Saga Prefecture has a population of 809,248 (1 August 2020) and has a geographic area of 2,440 km2 (942 sq mi). Saga Prefecture borders Fukuoka Prefecture to the northeast and Nagasak ...

Japan Japan ( ja, 日本, or , and formally , ''Nihonkoku'') is an island country in East Asia. It is situated in the northwest Pacific Ocean, and is bordered on the west by the Sea of Japan, while extending from the Sea of Okhotsk in the north ...

. Its ruins have been protected as a Prefectural Historic Site.

History

In the

Muromachi period The is a division of Japanese history running from approximately 1336 to 1573. The period marks the governance of the Muromachi or Ashikaga shogunate (''Muromachi bakufu'' or ''Ashikaga bakufu''), which was officially established in 1338 by t ...

, Suko Castle was the home castle of the Hirai clan. The lords of the castle included Hirai Tsuneharu. The

Ryūzōji clan was a Japanese kin group which traces its origin to Hizen Province on the island of Kyushu. Nussbaum, Louis-Frédéric. (2005)"Hōki"in ''Japan Encyclopedia'', p. 802. History The clan was founded by Fujiwara no Suekiyo in 1186. The clan was al ...

attacked the castle on four occasions, and it finally fell in 1574. After the fall of the Hirai clan,

Ryūzōji Takanobu was a Japanese ''daimyō'' in Hizen Province during the Sengoku period. Takanobu was the head of the Ryūzōji clan. Biography Takanobu was the grandson of Ryūzōji Iekane (1454-1546). Ryūzōji Takanobu is known for expanding his clan's ho ...

moved his residence to Suko Castle. Takanobu made extensive renovations to the castle, adding new ''

kuruwa is a Japanese term for the walls of a Japanese castle, and the regions bounded by the arrangement of those walls. The term may also be written as 郭, and the term is also used for castles built after the Edo period. The kuruwa serves as a def ...

'' walls,

earthworks Earthworks may refer to: Construction *Earthworks (archaeology), human-made constructions that modify the land contour * Earthworks (engineering), civil engineering works created by moving or processing quantities of soil *Earthworks (military), m ...

, fortifications, a double

moat A moat is a deep, broad ditch, either dry or filled with water, that is dug and surrounds a castle, fortification, building or town, historically to provide it with a preliminary line of defence. In some places moats evolved into more extensive ...

, and a ''koguchi'' entrance, expanding it to 560 m on east-west axis and 580 m on north-south axis, making it the largest flatland-mountain castle in Saga Prefecture. As a result of the renovations, it became an important castle that effectively ruled and controlled northern Kyushu. During the

Sengoku period The was a period in History of Japan, Japanese history of near-constant civil war and social upheaval from 1467 to 1615. The Sengoku period was initiated by the Ōnin War in 1467 which collapsed the Feudalism, feudal system of Japan under the ...

, the Ryūzōji clan, along with the

Ōtomo clan was a Japanese samurai family whose power stretched from the Kamakura period through the Sengoku period, spanning over 400 years. The clan's hereditary lands lay in Kyūshū. Origins The first family head, Ōtomo Yoshinao (1172–1223), took ...

and

Shimazu clan The were the ''daimyō'' of the Satsuma han, which spread over Satsuma, Ōsumi and Hyūga provinces in Japan. The Shimazu were identified as one of the '' tozama'' or outsider ''daimyō'' familiesAppert, Georges ''et al.'' (1888). in contrast ...

, ruled

Kyushu is the third-largest island of Japan's five main islands and the most southerly of the four largest islands ( i.e. excluding Okinawa). In the past, it has been known as , and . The historical regional name referred to Kyushu and its surroun ...

as one of the three great

daimyo were powerful Japanese magnates, feudal lords who, from the 10th century to the early Meiji period in the middle 19th century, ruled most of Japan from their vast, hereditary land holdings. They were subordinate to the shogun and nominally ...

of Kyushu. From Suko Castle, Takanobu ruled

Hizen was an old province of Japan in the area of the Saga and Nagasaki prefectures. It was sometimes called , with Higo Province. Hizen bordered on the provinces of Chikuzen and Chikugo. The province was included in Saikaidō. It did not incl ...

, Higo, Buzen, Chikugo, and Chikuzen Provinces, and Suko Castle became the capital of the great domain. When Takanobu was killed in the Battle of Okitawate, his younger brother, Ryūzōji Nobukane, became the lord of the castle. In 1580, Ryūzōji Masaie succeeded his father and moved to Suko Castle.

Gallery

File:Suko Castle main area entrance.jpg, Remaining stone wall of Suko Castle File:Suko Castle main area and rocks.jpg, Stones called ''bulletproof stone''

References

{{coord missing, Saga Prefecture Castles in Saga Prefecture Historic Sites of Japan Former castles in Japan Ruined castles in Japan Ryūzōji clan