Inuyama Castle

Overview

Inuyama Castle (犬山城, Inuyama-jō) is a hirayama-style Japanese castle — a fortress built on a hill within a plain — located in the city of Inuyama, Aichi Prefecture. The castle overlooks the Kiso River, which serves as the border between Aichi and Gifu Prefectures. It is one of the 12 Japanese castles still in existence that were built before the Edo period, and its construction began in 1469, during the Muromachi period (1336–1573), in the first year of the Bunmei 文明 era. The castle has been designated a National Historic Site since 2018.

History

The castle’s origins date to 1469, when construction began under the authority of the Muromachi shogunate. Inuyama Castle was built as a strategic stronghold overlooking the Kiso River, a natural boundary that made the site valuable for controlling movement between the provinces. Over the following decades, the castle changed hands among several warlord families as regional power shifted during the Sengoku period.

The castle played a role in the Battle of Komaki and Nagakute, a major conflict fought in 1584 between the forces of Toyotomi Hideyoshi and a coalition led by Tokugawa Ieyasu. During that campaign, Inuyama Castle was the site of a specific engagement known as the Siege of Inuyama, in which the castle was attacked and captured. The castle also experienced a significant event of destruction at some point in its history, though the keep tower survived or was later rebuilt.

In the Edo period, the castle became the seat of the Inuyama Domain, a feudal domain whose administrative headquarters were located at the castle. The domain was ruled by the Naruse clan, who held the castle until the end of the shogunate. Unlike many Japanese castles that were dismantled or destroyed during the Meiji Restoration and the subsequent modernization of Japan, Inuyama Castle’s keep tower remained standing, making it one of the rare pre-modern structures of its kind.

What Stands There Today

The most significant surviving structure at Inuyama Castle is the keep tower, known in Japanese as the tenshu. This tower is one of only 12 pre-modern tenshu remaining in Japan — that is, keep towers built before the Edo period that have survived into the present day. The tenshu of Inuyama Castle has been determined to be one of the oldest remaining tenshu in the country, although Maruoka Castle also makes this claim, and the question of which is older remains a point of contention among historians.

The keep tower is a designated part of the castle’s overall structure and is the primary attraction for visitors. The castle is also listed as one of the 100 Fine Castles of Japan, a selection of historically significant castles compiled by the Japanese Castle Foundation. The surrounding grounds retain elements of the original fortification layout, including stone walls and earthworks, though the keep tower is the main intact structure. In 2018, the entire castle site was formally recognized as a National Historic Site, cementing its status as a nationally important cultural asset.

The Name in Japanese

The castle’s name in Japanese is 犬山城. The kana reading is いぬやまじょう, and the romaji is Inuyama-jō.

The name breaks down character by character as follows:

• 犬 (いぬ, inu): meaning “dog.” This character is the first element of the name and gives the castle its distinctive animal reference.
• 山 (やま, yama): meaning “mountain.” This character indicates the castle’s hilltop or elevated position, fitting for a hirayama-style fortress built on a rise.
• 城 (じょう, jō): meaning “castle.” This is the standard suffix for Japanese castle names and appears in countless fortifications across the country.

Taken together, 犬山城 means “Dog Mountain Castle.” The name likely derives from the local place name Inuyama, which itself uses the same two characters. For a learner of Japanese, the name is a useful example of how castle names combine a place identifier with the suffix 城, and how the reading of 山 shifts from the standalone yama to yama in compound position, while 城 shifts from shiro (the standalone reading) to jō when attached to a name.

Visiting and Context

Inuyama Castle is located in the city of Inuyama, in Aichi Prefecture, at coordinates 35.3883333, 136.9391667. The castle sits directly beside the Kiso River, and visitors can see the keep tower rising above the water from the opposite bank in Gifu Prefecture. The castle is accessible from Nagoya by train, making it a popular day-trip destination for those interested in feudal Japanese architecture.

The keep tower is open to the public, and visitors can climb its interior to reach the top floor, which offers views over the river and the surrounding plains. Because the tower is one of only 12 pre-modern tenshu, it attracts both casual tourists and students of castle history. The castle’s inclusion in the 100 Fine Castles of Japan list further marks it as a site of national significance.

For those studying Japanese, the castle offers a chance to see a structure whose name, history, and physical setting all reinforce vocabulary related to geography and architecture. The site’s designation as a National Historic Site in 2018 ensures that its preservation will continue, and the castle remains a rare link to the Muromachi period and the turbulent centuries that followed.