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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

  • Nagoya Castle

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    Nagoya Castle, originally built by the Owari Domain in 1612 during the Edo period, stands on the site of an earlier Oda clan castle from the Sengoku period. It became the centerpiece of Nagoya-juku, a significant castle town on the Minoji road, which connected two major Edo Five Routes: the Tokaido and the Nakasendo. In 1930, ownership of the castle was transferred to the city by the Imperial Household Ministry, establishing it as the focal point of modern Nagoya. Although partially destroyed in the Pacific War in 1945, the castle has undergone continuous restoration and preservation efforts since 1957.

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  • Matsushiro Castle

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    Matsushiro Castle, originally known as Kaizu Castle, is located in what was once Matsushiro town, now part of Nagano City. The site is recognized as a National Historic Site of Japan. Situated on the northern Shinano flatlands between the Chikuma River and a former riverbed that serves as a natural outer moat to the north, the castle and its surrounding town were prone to flooding due to their location.

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  • Fushimi Castle

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    Fushimi Castle, also known as Momoyama Castle or Fushimi-Momoyama Castle, is located in Fushimi Ward, Kyoto. Originally built by Toyotomi Hideyoshi between 1592 and 1594 as his retirement residence, the castle was destroyed by the 1596 Keichō–Fushimi earthquake and later rebuilt. However, it was demolished again in 1623, and its site now houses the tomb of Emperor Meiji. A replica of the castle was constructed nearby in 1964.

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  • Odawara Castle

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    Odawara Castle, located in the city of Odawara, Kanagawa Prefecture, Japan, is a reconstructed historical site with roots dating back to the Kamakura period (1185–1333). The current donjon (main keep) was rebuilt using reinforced concrete in 1960 on the stone foundation of the original structure, which was dismantled between 1870 and 1872 during the Meiji Restoration.

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  • Shinpu Castle

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    Shinpu Castle was a Japanese hirayama-style fortress from the Sengoku period, situated in what is now Nirasaki, Yamanashi Prefecture. It served as the main stronghold of warlord Takeda Katsuyori. Designated as a National Historic Site in 1973, the castle occupies a strategic position on a mountain with steep cliffs, overlooking the Kamanashi River to the west of Kofu, where Takeda Shingen’s Tsutsujigasaki Castle once stood.

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  • Takato Castle

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    Takato Castle, located in the city of Ina in southern Nagano Prefecture, Japan, was a notable stronghold during the Sengoku period. By the end of the Edo period, it was the residence of a cadet branch of the Naito clan, the daimyo of the Takato Domain. Also known as Kabuto Castle, it was originally constructed in the 16th century and is now mostly in ruins.

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  • Takatenjin Castle

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    Takatenjin Castle was a yamashiro-style fortress from Japan's Sengoku period, situated in the Kamihijikata and Shimohijikata districts of Kakegawa, Shizuoka Prefecture. Designated a National Historic Site in 1975, with an expanded protected area in 2007, its ruins remain a significant historical landmark.

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  • 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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