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.
Tsunesige’s son and successor, Chiba Tsunetane (1118–1201), fought on the Minamoto side during the Genpei War, taking part in particular in the Battle of Fujikawa in 1180 and the Battle of Ichinotani in 1184.
For their contributions to the establishment of the Kamakura shogunate, the Chiba clan was granted the provinces of Shimosa and Kazusa. During the Kamakura period, the Chiba were regarded as one of the most powerful and influential clans. In the Muromachi period, alongside houses such as the Utsunomiya and Satake, they were counted among the “Eight Traditional Clans of the Kanto Region.”
Nearly every new lord of Chiba Castle expanded and strengthened it, and as a result the castle became one of the most formidable fortresses of its time.
However, internal conflicts within the clan gradually weakened the Chiba house and ultimately led to its decline in the mid-fifteenth century. During the so-called Kyotoku Incident—a series of armed clashes from 1454 to 1482 over control of the Kanto region among the Ashikaga, Uesugi, and other clans—Chiba Castle was attacked in 1455 by the forces of Hara Tanefusa, a former vassal of the Chiba clan.
In the same year, another blow was dealt to the Chiba clan by Makuwari Yasutane of a related family. He defeated the remaining heirs of the Chiba clan, took the Chiba surname for himself, and proclaimed himself the fourteenth head of the Chiba house. He built a new castle, Motosakura Castle, in the nearby town of Sakura. Chiba Castle was abandoned, and today only traces of earthen fortifications remain.
The history of the castle remains a subject of debate among modern scholars. According to another theory, Chiba Castle was originally founded by the Hara clan, while the Chiba maintained only a small fortified residence nearby.
In 1861, the ruins of Chiba Castle were selected as one of the “Eight Scenic Views of Chiba.” In 1909, the site was opened to the public, and in 1959 the “Inohana Historical Park” was established on the site of the ruins.
In 1967, a massive five-story donjon made of reinforced concrete was built in Inohana Park. It has no connection to the historical castle, as towers of this type did not yet exist in the fifteenth century. It should be noted that, unlike many other so-called bastard castles, this structure is honestly designated by the city authorities as a “historical museum in the form of a medieval castle,” rather than a reconstruction. In other words, the local community is not attempting to capitalize on the claim of having reconstructed a historical castle, and such honesty can only be praised.
The museum houses a solid collection of artifacts, and the observation deck on the fifth floor offers an excellent view of the surrounding area—on clear days, even Mount Fuji can be seen.
The castle complex is designated as a “municipal historical site.” Another name for the castle is Inohana.
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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Sunomata Castle
Oda Nobunaga, as part of his “final solution” to the conflict with the Saitō clan, conceived the construction of a fort in the Sunomata area, which was intended to serve as a forward base for an attack on Inabayama Castle (later renamed Gifu). Sunomata was a swampy area located between Ogaki Castle, a stronghold of the Oda clan, and Inabayama, the main fortress of the Saitō clan. Earlier attempts to build fortifications in this area, carried out by Oda generals Sakuma Nobumori and Shibata Katsuie, had all ended in failure. After that, the task was entrusted to the young vassal Kinoshita Tokichirō, who later became known as Toyotomi Hideyoshi.
