In 1334, Ikeda Noriyoshi built a small fort on this site, which over time was repeatedly expanded and rebuilt. During the Ōnin War of 1467–1477, the Ikeda clan supported the Western Coalition. As a result, Ikeda Castle was attacked and captured by the forces of the Eastern Coalition, but it was soon recaptured, allowing it to avoid serious destruction.
In the early 16th century, during internal conflicts within the Hosokawa clan, the castle repeatedly became a battlefield and suffered from the fires that accompanied these clashes. This is evidenced by the results of archaeological excavations, which revealed layers of burned earth dating to this period, as well as the remains of wooden structures that had been charred into charcoal. After each such episode of destruction, the castle was rebuilt once again.
In 1557, Ikeda Katsumasa confronted the forces of the Oda clan. After the capture of the castle in 1558, Oda Nobunaga highly praised Katsumasa’s abilities, made him one of his vassals with an income of 60,000 koku of rice, and allowed him to retain Ikeda Castle. Katsumasa subsequently strengthened and rebuilt the castle, making use of the plans and ideas provided by Nobunaga.
In 1570, Araki Murashige rose in rebellion against the Ikeda clan. Initially, he had served as a vassal of Ikeda Katsumasa and became a member of the Ikeda family by marrying the daughter of Ikeda Nagamasa. Later, however, Murashige aligned himself with the Miyoshi clan, organized a revolt, expelled Katsumasa, and seized power within the Ikeda clan. Although he was considered a supporter of Shogun Ashikaga Yoshiaki, in 1571 he sided with Oda Nobunaga in Nobunaga’s conflict with the shogun. In 1574, Murashige took part in suppressing the uprising of Itami Tadataka in Kawachi Province, besieged Itami Castle, and captured it. As a reward for this victory, Nobunaga granted the castle to Murashige, and around the same time the castle was renamed Arioka.
After Murashige moved to Arioka Castle, Ikeda Castle was almost no longer used. Nevertheless, in 1578 Murashige defected to the rebel Ikkō-ikki, and during the siege of Arioka Castle by Oda forces, Ikeda Castle served as the headquarters of the punitive expedition. After the fall of Arioka Castle in 1579, Ikeda Castle was permanently abandoned and ceased to be used.
In 1989, large-scale archaeological investigations were carried out on the castle ruins, leading to the discovery of remains of fortifications and various artifacts dating to the Sengoku period.
In 2000, the ruins were turned into Ikedashiroato Park. Earthen rampart walls (dobei), several types of gates, and a mihari-no-yagura watchtower were reconstructed. Towers of this type are considered predecessors of the tenshu donjons of later periods. At the same time, this tower is a notional, “fake” reconstruction, since according to surviving descriptions and excavation materials, no such structure actually existed on the grounds of the historical castle.
Overall, the reconstructed buildings represent a clear and high-quality example of the fortifications of a typical early to mid–Sengoku period castle, even though they are not directly tied to the historical Ikeda Castle itself. In addition, the site features a beautiful garden with a pond inhabited by carp and turtles, which also attracts visitors.
See also
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Arato Castle
Arato Castle was built in 1524 by the Yamada clan under the orders of their overlord, Murakami, as a small mountain fort. Over time, it gained strategic importance and became a focal point in the conflict between two famous daimyō of the Sengoku period — Takeda Shingen and Murakami Yoshikiyo. This conflict turned the castle into one of the key fortifications in the struggle for control over Shinano Province.
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Tatsuno Castle
Tatsuno Castle is not a single fortification but rather a complex consisting of two parts: a mountain fortress located at the summit of Mount Keirozan and a flatland-mountain castle situated at its base. The mountain stronghold was built around 1499 by Akamatsu Murahide. During the Muromachi period, the Akamatsu clan was an influential family that, at the height of its power, controlled the provinces of Settsu, Harima, Bizen, and Mimasaka. Murahide’s ancestors were directly involved in the events of the Genkō War in the 14th century and in the subsequent establishment of the Ashikaga shogunate. However, by the 15th century, due to the process of gekokujō, the clan began to lose its position under pressure from rising families, including their former vassals—the Urakami and Bessho clans. In addition, the Akamatsu faced constant pressure from the Amago clan of Izumo Province.
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Takamatsu Castle
Takamatsu Castle was founded by Ikoma Chikamasa (1526–1603), who was appointed ruler of Takamatsu by Toyotomi Hideyoshi in 1587. The following year, Chikamasa began construction of the castle on the coast of the Inland Sea (Setonaikai), completing it by 1590.
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Sawayama Castle
During the Kamakura period, Sabo Tokitsuna, the sixth son of Sasaki Sadatsuna, built a fort on Mount Sawayama. This fort occupied a strategically important position because it allowed control over traffic along the important Tōsandō route, which was later known as Nakasendō. This road connected the capital, Kyoto, with the eastern regions of the country. Due to its location, the fortification held great military importance, and during periods of civil war it repeatedly became the site of fierce battles.
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Nadzima Castle
It is believed that the first structures on this site were built by Tachibana Akitoshi (?-1568), head of the Tachibana clan, a branch family of the Ōtomo clan, as auxiliary fortifications for Tachibanayama Castle. In 1587, Toyotomi Hideyoshi established control over the island of Kyushu and granted Chikuzen Province to Kobayakawa Takakage, one of the leading vassals of the Mori clan. Takakage began construction of a new castle on the site of the existing fortifications in 1588. The exact date of completion is unknown, but by the time the invasion of Korea began in 1592, the castle had already been finished, as records note that Toyotomi Hideyoshi stayed there overnight on his way to Hizen Nagoya Castle, which served as the headquarters of the invasion forces.
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Kubota Castle
The founder of the castle is considered to be Satake Yoshinobu (1570–1633). Yoshinobu was one of the six great generals of Toyotomi Hideyoshi. During the Odawara Campaign of 1590, he took part in the siege of Oshi Castle under the command of Ishida Mitsunari, with whom Yoshinobu developed a good relationship.
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Kavanhoe Castle
Kawanoe Castle is located on the small Wasi-yama hill near the port area of the Kawanoe district in the city of Shikokuchuo, occupying a central position along the northern coast of Shikoku Island. Kawanoe was also known as Butsuden Castle. The term “butsuden” in Japan refers to temple halls, and for this reason it is believed that a Buddhist temple once stood on the site before the castle was built. Due to its location at the junction of four provinces on Shikoku Island, Kawanoe held significant strategic importance and was repeatedly targeted by rival forces seeking military control over the region.
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Yokote Castle
The founder of the castle is considered to be the Onodera clan. The Onodera were originally a minor clan from Shimotsuke Province and served Minamoto no Yoritomo (1147–1199), the founder of the first shogunate. The Onodera distinguished themselves in battle against the Fujiwara clan of the Ōshū branch and were rewarded with lands around Yokote. Around the 14th century, the Onodera moved to Yokote as their permanent residence. Their original stronghold was Numadate Castle, but after a series of clashes with the powerful Nambu clan, they relocated their base to the site of present-day Yokote Castle. It was likely during this time that the first fortifications appeared at the castle.
