* Image is for illustrative purposes only.Izushi Castle (Ariko-yama Castle)
出石城（有子山城）
Izushi Castle (Ariko-yama Castle) is a historic castle in kinki dating from the In Keichō 9 (1604), Koide Yoshihide built Izushi Castle at the foot of the mountain as an early modern fortress. It functioned as a two-tiered defensive complex combined with Ariko-yama Castle (a medieval mountain castle) behind it., whose lord was Yamana Suketosa (rebuilt Ariko-yama Castle) → Hashiba Hideyoshi (after Tajima pacification) → Koide Yoshimasa → Sengoku clan → Matsudaira clan (through Meiji).
Overview
Izushi Castle is an early-modern castle complex located in Izushi-cho, Toyooka City, Hyogo Prefecture. Along with the medieval mountain castle "Ariko-yama Castle" (321m elevation) that remains at the peak of the hill behind it, Izushi Castle embodies the history of "Izushi, Tajima Province" and is designated as a National Historic Site together with the castle town of Izushi—known as the "Little Kyoto of Tajima."
Izushi was the headquarters of the Yamana clan, who ruled Tajima from medieval times. From the Northern and Southern Courts period through the Muromachi period, the Yamana clan was such a major power that they were called the "One-Sixth Lords" (Rokubun no Ichinodono), controlling eleven of Japan's sixty-six provinces at one point. Yamana Sōzen, who was a principal cause of the Ōnin War (1467–77), was a figure who embodied the Yamana clan at their peak. Based at Ariko-yama Castle, the Yamana of Tajima ruled the region of Tajima, Tamba, and Tango.
In the late Sengoku period, with Hashiba Hideyoshi's pacification of Tajima (Tenshō 8, 1580), the power of the Yamana clan came to an end. Hideyoshi, together with Akechi Mitsuhide, undertook military expansion toward the Chugoku region and Tajima. Through this pacification of Tajima, Oda Nobunaga's control of the Chugoku and San'in regions was established. After the Battle of Sekigahara, in Keichō 9 (1604), Koide Yoshishige built the early-modern castle of Izushi at the mountain's foot as a political and administrative center, and Ariko-yama Castle functioned as a detached fort (tsume-jiro; final stronghold), completing a two-stage fortification plan.
In the Edo period, a unique castle-town culture developed, including the "Sengoku Incident" (Sengoku Sōdō), an internal clan dispute under Sengoku Masaaki, and the history of "Izushi Plate Soba" (Izushi sara-soba), said to have been introduced by the Sengoku clan—transferred from Ueda, Shinshu (Nagano)—who brought soba culture with them. The castle town of Izushi, which still retains the town plan of the Edo period, has become a major cultural and tourism hub of Tajima alongside Toyooka and Kinosaki Onsen.
Connection to Swords
Izushi Castle's connection to Japanese swords is deeply rooted in both the Yamana clan—one of the greatest warrior families of medieval Japan—and Tajima Province, an important source of raw materials for Japanese sword production. The Yamana clan stands as one of the principal figures in the Ōnin War, a dynasty that shaped medieval Japanese history, and their warrior culture overlapped with the golden age of sword culture in the Nanbokuchō and Muromachi periods. During this era—specifically the "Nanbokuchō period of turmoil (1336–92)" and "early Muromachi"—in the history of the Japanese sword, this was the distinctive period when numerous masterpieces from the early Kamakura through Nanbokuchō periods came into being, and major powers such as the Yamana clan were the principal patrons and collectors of such renowned blades. Some swords that are said to have been transmitted to the Tajima Yamana clan remain in regional museums and shrines, conveying aspects of medieval warrior sword culture. Tajima Province had been known since antiquity as a producer of iron sand, called "Tajima iron (Tajima no kurogane)". The Chūgoku mountain range extending behind Izushi and Toyooka—in the regions of Hyōno and Hachi-fushi—held abundant deposits of iron sand, and Tajima smiths throughout the ancient and medieval periods supplied the metalworking needs of regional warriors. This tradition of "Tajima smithing (Tajima kaji)" continued through the Sengoku period and, together with the iron production and mining operations of Izushi and Ikuno, formed the foundation of Tajima's metalworking industry. Ikuno (in Asago City, Hyogo Prefecture), adjacent to Izushi, was renowned as the site of the "Ikuno Silver Mine," and during the Sengoku period control of the silver mines was fiercely contested among the Yamana, Amago, Mōri, and Oda clans. The revenues from the silver mines functioned as funding for the procurement of military supplies, beginning with swords and armor, and Izushi Castle, as a fortress within this silver-mining economic sphere, held important significance from the perspective of sword history.
Highlights
- Izushi Castle ruins (National Historic Site) — torii gate approach to Inari citadel, corner turrets, and stone walls overlooking the Tajima-Kyoto-style castle town
- Ariko-yama Castle ruins (medieval mountain castle) — Yamana clan hilltop fortress behind Izushi Castle, with vertical moats, bailey terraces, and stone walls
- Izushi sara-soba — Izushi's signature small-plate soba noodles, a culinary tradition traced to the Sengoku clan's transfer from Shinshu
- Izushi Eirakukan — 1910-built kabuki theater, one of Japan's oldest surviving traditional playhouses, nationally registered
- Ikuno Silver Mine (Asago City) — the silver mine contested by Yamana, Mōri, and Oda clans, open as a historical mining site
- Takeda Castle ruins (Asago City) — the famous 'castle in the sky' stone-wall mountain castle associated with the Yamana, approx. 30 min by car from Izushi
* Opening hours and admission fees are subject to change. Please check the official website before visiting.