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Tamba Sasayama Castle, also known as Sasayama or Kirigajo (Mist Castle), is a flatland castle (hira-jiro) situated on a gentle rise in the Tamba region of Hyogo Prefecture. It was constructed in 1608 as part of Tokugawa Ieyasu's strategy to prepare for an attack on Osaka, aiming to bring an end to the Toyotomi clan. Ieyasu ordered the castle's construction using the Tenka Bushin system, engaging 20 former enemy daimyo and their forces to complete the complex within six months. This system kept the former enemies close and preoccupied, financially straining them and limiting their capacity for further conflict. The stones used in Sasayama Castle feature engravings called kokumon, indicating who made each part of the walls and preventing theft by other lords' men.

The castle's design was crafted by Todo Takatora, a renowned castle architect, and construction was overseen by Ikeda Terumasa. The castle's wide moats and impressive ishigaki stone walls, along with its well-planned layout, are notable features. The three main gates are strategically positioned, and remnants of the Umadashi, special defensive ramparts outside the main gates, can still be seen. Although the castle has a tenshu-dai, or tower keep base, a keep was never constructed. One theory suggests that Ieyasu, fearing the castle's formidable design could be used against him, decided against building the keep. In reality, the plans were abandoned due to Ieyasu's urgency to start constructing Nagoya Castle. Similarly, the keep at Iga Ueno, another Todo Takatora design, was destroyed by a typhoon during construction, and Ieyasu, eager to eliminate the Toyotomi threat, canceled its rebuilding.

Most of Sasayama Castle was destroyed around 1871 at the end of the feudal period. However, the Dai O-shoin, the main palace building, remained intact until it was gutted by US aerial fire-bombing in 1944. The O-shoin was reconstructed in 2000, based on old photographs and the architecture of Nijo Palace in Kyoto, which itself was modeled after Nagoya Castle’s Honmaru Goten Palace. Interestingly, after completing Sasayama Castle, Ieyasu immediately ordered the same 20 daimyo to begin work on the larger, grander Nagoya Castle.

Parts of the original castle town still exist, and several traditional samurai houses have been preserved by the local government. Sasayama Castle is a fascinating site to explore, with ongoing preservation projects aimed at safeguarding the castle and its surrounding historical areas.

 


See also

  • Yoshida Castle

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    Yoshida Castle is renowned worldwide, particularly through the intricate woodblock prints by Edo Period artist Hiroshige. His famous series, depicting the 53 stages of the Tokaido—the historic route between Kyoto and Edo (modern-day Tokyo)—includes the 34th print, which shows workmen repairing a castle overlooking a wooden bridge crossing a wide river. This scene captures the Toyokawa River at Toyohashi in southeast Aichi Prefecture, and the castle is Yoshida Castle.

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  • Yamato Koriyama Castle

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    The impressive ruins of Koriyama Castle sit atop a small hill, surrounded by two rivers. The strategic positioning and strong layout of the castle served it well through the final years of the Sengoku period and the peaceful days of the Edo period.

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  • Yamanaka Castle

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    Yamanaka Castle, established by Hojo Ujiyasu in the 1560s, is located in what is now eastern Mishima, Shizuoka Prefecture. This castle served as the first line of western defense for the main Hojo Castle at Odawara. Carved into the side of a 586-meter-high mountain, Yamanaka Castle was strategically positioned along the Tokaido Highway, offering superb views of nearby Mt. Fuji, the ocean, and the road leading to Odawara.

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  • Uwajima Castle

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    Uwajima Castle, located in Uwajima City, Ehime Prefecture, Shikoku, is one of the 12 remaining Japanese castles with an original keep. Known for its small size, Uwajima Castle is relatively difficult to access, which means it is less frequented by tourists.

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  • Ueda Castle

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    Ueda Castle in Nagano Prefecture once stood prominently on a cliff overlooking the Saigawa River. Also known as Amagafuchi-Jo, Isesaki-Jo, Matsuo-Jo, and Sanada-Jo, it was built around 1583 by its first master, Sanada Masayuki. This sturdy yet small fortress cleverly utilized the surrounding natural defenses, including the river, steep rocky cliffs, the layout of the town below, and the strategically designed waterways to hinder attackers. Ueda Castle was fortified with seven defensive yagura (watchtowers) atop robust stone walls and had two large gates with watchtowers above them.

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  • Tsuyama Castle

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    Tsuyama Castle, located in Tsuyama City, Okayama Prefecture, is celebrated as one of Japan's top three major hilltop (Hirayama) castles, alongside Himeji and Matsuyama Castles. Originally, Tsuyama Castle comprised 77 structures, including the main keep, various yagura (watchtowers), gates, palaces, and living quarters. For comparison, Hiroshima Castle had 76 structures, and Himeji had 61. The first castle on this site was built in 1441 but was soon abandoned. The large-scale construction that we recognize today began in 1603 under the orders of Mori Tadamasa. The castle served as the administrative base for the Tsuyama Han daimyo, the Mori clan from 1603 to 1697, and the Matsudaira clan from 1698 to 1871.

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  • Tsu Castle

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    Tsu Castle, located in Tsu City, Mie Prefecture, was originally built by Hosono Fujiatsu in 1558 and was known as Anotsu Castle, named after the old region. The site was strategically chosen at the confluence of the Ano and Iwata Rivers, which naturally formed a moat around the castle, while the nearby port served as a vital trade route.

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  • Sadowara Castle

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    Sadowara Castle in Miyazaki Prefecture was a mountaintop yamajiro castle, initially built by the Tajima clan during the Nanboku-Cho period (1334-1394). As was typical of castles from that era, Mt. Kakusho, the chosen mountain, was terraced to create various baileys, or kuruwa. While defensive structures were constructed at the top and around the mountain, the lord's main living quarters and administrative offices were situated at the mountain's base.

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