Kaminoyama Castle

Overview

Kaminoyama Castle (上山城, Kaminoyama-jō) is a hirayama-style Japanese castle — a castle built on a low hill rather than a mountain peak or a flat plain — standing in the centre of the city of Kaminoyama, in eastern Yamagata Prefecture. Its construction is dated to 1535, the fourth year of the Tenbun era (天文), placing it in the Muromachi period (1336–1573). The site sits at 38.1575°N, 140.2761°E.

The castle is also known as Tsukioka Castle (月岡城, Tsukioka-jō). Through the Edo period it served as the headquarters of the daimyō (大名, a territorial lord) of Kaminoyama Domain. It was contested in the Siege of Kaminoyama, and a Shinto shrine, Tsukioka Shrine, stands within the castle grounds.

History

Kaminoyama Castle was built in 1535, in the fourth year of Tenbun. The Muromachi period in which it rose was an era of fragmented authority, when warrior houses across the Japanese archipelago fortified hilltops and passes to hold the roads and river valleys they depended on. Kaminoyama, in the Yamagata basin, controlled one of the routes running north through the mountains of what is now Yamagata Prefecture.

The castle's defensive value was tested in the Siege of Kaminoyama, the engagement that gives the site its place in the military history of the region. The castle's position on a low hill — the hirayama form — let its defenders use the surrounding ground while keeping the advantages of elevation, and made it a target worth taking rather than bypassing.

With the establishment of the Tokugawa order in the seventeenth century, Kaminoyama Castle became the headquarters of Kaminoyama Domain. A domain was the hereditary territory granted to a daimyō, and its castle was the administrative and military centre from which that territory was governed. For the whole of the Edo period, the lords of Kaminoyama Domain ruled from this hill, collecting the domain's rice revenues, maintaining its roads, and answering to the shogunate in Edo.

What Stands There Today

The castle site is in the centre of modern Kaminoyama, and Tsukioka Shrine stands within the castle grounds. Shrines of this kind were often established on the grounds of former castles, where the site's earlier history gave the new foundation its name and its prestige. The shrine carries the castle's alternative name, Tsukioka, tying the religious site directly to the fortress that preceded it.

Kaminoyama itself remains a city in eastern Yamagata Prefecture, and the castle's central position means the site is embedded in the town rather than set apart from it. The hill that made the castle defensible in the sixteenth century is the same hill around which the modern city is arranged.

The Name in Japanese

The castle's name is written 上山城. It is read かみのやまじょう in kana, and rendered in romaji as Kaminoyama-jō.

The name breaks down into three kanji:

• 上 — read kami here. The character means "above" or "upper". It is one of the most common directional kanji in Japanese, and it appears in place names throughout the country to mark the upper part of a valley, a road, or a settlement.
• 山 — read yama here. The character means "mountain". Japanese place names are dense with it, and it is the element that tells the reader this is hill country.
• 城 — read jō here. The character means "castle". When it follows a place name, it names the fortress of that place, and it is the standard final element in the names of Japanese castles.

The first two characters together, 上山, spell Kaminoyama — "upper mountain" — the name of both the city and the hill. The final 城 marks the fortification. The reading jō is the Sino-Japanese pronunciation of 城; the native Japanese reading of the same character is shiro, which is the everyday word for a castle. Castle names in formal use almost always take the jō reading, so 上山城 is Kaminoyama-jō, not Kaminoyama-shiro.

The alternative name, 月岡城 (Tsukioka-jō), is built the same way. 月 is "moon", 岡 is "hill" or "ridge", and 城 again supplies "castle" — "Moon Hill Castle". The shrine on the grounds, Tsukioka Shrine, preserves that older name.

For a learner, 上山城 is a useful name to know because all three of its characters recur constantly. 山 appears in hundreds of Japanese surnames and place names; 城 appears in castle names across the country and in the word 城下町 (jōkamachi), the "castle town" that grew up around a fortress like this one; and 上 is one of the first directional characters a student meets.

Visiting and Context

Kaminoyama lies in eastern Yamagata Prefecture, and the castle site is in the middle of the city, with Tsukioka Shrine within the grounds. The location is the point of the visit as much as any single structure: the hill that was chosen in 1535 for its command of the surrounding country still gives a clear view over the town that grew around it.

The castle belongs to a wider pattern worth knowing. From the fifteenth century onward, Japanese warrior houses covered the landscape with fortifications — mountain castles, hill castles like this one, and later the great flatland castles of the Edo period. Kaminoyama is a hirayama castle, the middle category: a low hill rather than a peak or a plain. Its later career as the seat of Kaminoyama Domain shows the same site being reused across two very different eras — first as a contested stronghold in the Muromachi wars, then as the quiet administrative headquarters of a Tokugawa-period domain.