
Matsumoto Castle is a designated National Treasure, located on the plains of Matsumoto City in central Nagano Prefecture. As a hira-jiro, or castle built on the plains, it necessitated an extensive system of moats, stone and earthen walls, and gatehouses for defense.
Originally, the site was a fortress used by the Ogasawara clan around 1504. It was later taken by Takeda Shingen in 1550, and subsequently by Toyotomi Hideyoshi, who awarded it to Tokugawa Ieyasu. Ieyasu reinstated the Ogasawara clan, placing Ogasawara Sadayoshi in command. Sadayoshi named the area Matsumoto before Tokugawa Ieyasu replaced him with the trusted general Ishikawa Kazumasa.
From 1590, Kazumasa began rebuilding and expanding the castle but died in 1592. His son, Yasunaga, also known as Gemba, completed the work in 1594, including the current five-story black lacquered wooden-clad tower.
The construction inside the smaller Ko-tenshu tower and the main Tenshu tower is particularly interesting. The upright pillars in the older Ko-tenshu are rounded, while those in the main Tenshu are square, indicating different construction periods. The main keep and sub-keep towers are linked by fortified watari-yagura corridors. Both the Tenshu and Ko-tenshu feature ishi-otoshi rock-dropping hatches at the corners, indicative of their wartime construction. The southeastern corner has an open-plan yagura called the Tsukimi Yagura, or Moon-Viewing yagura, built in 1634 for moon-viewing parties, alluding to its peacetime construction.
The Tsukimi Yagura was added by Matsudaira Naomasa, Tokugawa Ieyasu's grandson, for his cousin, the third Shogun Iemitsu's planned visit, which was ultimately canceled. It is said that during a moon-viewing party in the Tsukimi Yagura, the moon can be seen three times: in the sky, reflected in the moat, and in your sake cup.

Matsumoto Castle is a collection of five separate National Treasures: the main keep, the Ko-tenshu, the two adjoining corridors, and the Tsukimi Yagura. The outer walls of the tenshu complex are covered in black lacquered shitami-itabari cladding, protecting the mud walls within and giving the castle a somber appearance, especially against the backdrop of the winter snow-capped northern Alps.
In 1872, following the collapse of the feudal system and the start of the Meiji Restoration, Matsumoto Castle was slated for demolition and sold at auction. However, citizens formed a group to save the castle, successfully preserving it for future generations. In the mid-Meiji period, the castle developed a lean, prompting civic groups to repair the tower keep. Designated a National Treasure in 1952, recent improvements have included the reconstruction of several gates and walls.
At the corner of the Taiko Yagura Mon Gate and the current entrance to Matsumoto Castle stands a large, rectangular rock about 2.5 meters high and weighing an estimated 22.5 tons, known as the Genba Stone. Named after Ishikawa Genba, the samurai lord tasked with the castle's redevelopment in 1590, the stone symbolizes power and financial strength. The story goes that Ishikawa Genba, hearing laborers complain about moving the heavy rock, swiftly executed the main complainer and displayed his head as a warning, ensuring the rock was quickly and quietly moved into place.
Matsumoto Castle, also known as Karasu-Jo or Crow Castle due to its black-walled main tower and adjoining towers resembling a crow spreading its wings, is a stunning example of Sengoku period castle architecture. It is one of only five castles designated as a National Treasure and, though off the standard tourist path, remains a remarkable destination.
See also
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Kaminoyama Castle

Kamino-yama Castle stood at the center of an important logistics hub, in the middle of the Yonezawa Plain, which served as the gateway to the western part of the Tohoku region. Roads connecting the Aizu, Fukushima, and Yamagata areas intersected here.
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Imabari Castle

Tōdō Takatora (1556–1630) served at different times as a vassal of several famous clans—Azai, Oda, Toyotomi, and Tokugawa. He took part in the Battle of Anegawa (1570), the Battle of Shizugatake (1583), the invasions of Kyushu and Korea, the Sekigahara campaign (1600), and the Siege of Osaka (1614–1615).
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Iwakuni Castle

Kikkawa Hiroie (1561–1625) was the grandson of the famous daimyo Mori Motonari and a vassal of the Mori clan. Under Mori Terumoto, he fought in both Korean campaigns and took part in the defense of Ulsan Castle. During the Battle of Sekigahara, Hiroie stood with his 3,000-man force on the side of the Western Coalition; however, even before the battle began, he sent Tokugawa Ieyasu a secret message stating that he did not intend to fight Tokugawa’s troops. As a result of his inaction, 15,000 soldiers under Mori Hidemoto were also unable to enter the battle, since Hiroie blocked their path.
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Gujo Hachiman Castle

Gujo Hachiman Castle is located on 350-meter Mount Hachiman, near the confluence of the Yoshidagawa and Kodaragava rivers, and not far from the Nagaragawa River. During the Sengoku period, this area was of great strategic importance: it stood at a key crossroads of routes connecting Mino Province in the south with the Sea of Japan in the north, and Hida Province in the east with Echizen Province in the west.
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Amagasaki Castle

The founding year of Amagasaki Castle is traditionally considered to be 1617, when Toda Ujikané built his castle here, making it the administrative center of the Amagasaki Domain. However, as early as the Sengoku period, a fortress built by the Hosokawa clan already stood on this site. After the fall of Itami Castle in 1579, Araki Murashige—formerly a vassal of Oda Nobunaga who had rebelled against him—fled to this earlier castle.
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Hiroshima Castle

Mōri Terumoto (1553–1625) was the grandson and rightful heir of the renowned Mōri Motonari. When Terumoto became the head of the Mōri clan in 1571, he inherited vast territories covering a large part of the San’in and San’yō regions in western Honshū. In addition, the Mōri clan possessed the largest and most technologically advanced naval fleet of its time.
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Fukuyama Castle

After the defeat of Toyotomi Hideyori’s supporters in the Osaka Campaigns of 1614–1615, many clans in Japan still remained not fully loyal to the Tokugawa shogunate, especially in the western Chūgoku region. Mizuno Katsunari (1564–1651), a cousin of Tokugawa Ieyasu, became the first of the Tokugawa house’s close retainers, the so-called fudai daimyō, to be relocated to this strategically important area.
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Tiba Castle

The founder of the Chiba clan is considered to be Chiba Tsunesige (1083–1180), who in 1126 moved his residence to the Inohana area and built a strongly fortified stronghold there. Although Tsunesige himself came from the Taira clan, the Chiba clan later supported Minamoto no Yoritomo, the future founder of the first shogunate.
