Sanda Castle

Overview and Location

**Sanda Castle** (officially the Sanda Jin'ya, or Sanda Garrison) was a fortification in the center of present-day Sanda City, Hyogo Prefecture, located in Settsu Province. Built on a tongue-shaped plateau on the right bank of the Muko River, the site exploited natural defensive terrain — three sides of the plateau drop approximately 20 meters as cliffs, making it a naturally secure position. During the Edo period, the Sanda Domain (also known as the Kuki Domain) was governed from this castle for approximately 240 years under the Kuki clan. Today the site is occupied by Hyogo Prefectural Arima High School (former secondary enclosure) and Sanda City Sanda Elementary School (former main enclosure), with only a stone marker commemorating the castle's existence.

Construction and the Muromachi-Sengoku Period

The castle's early history is uncertain, with few reliable primary sources. One account attributes its construction to the Settsu Arima clan during the Muromachi period, consistent with the Arima clan's documented control over the surrounding area during the conflicts of the Nanbokuchō era.

During the Tenshō era (1573–1592) of the Sengoku period, Araki Heidayū — a retainer of Araki Murashige — occupied Sanda Castle. When Araki Murashige rose against Oda Nobunaga in 1578 (the Siege of Arioka Castle), Sanda Castle, within Araki's sphere of control, became a target of Oda military operations. After the fall of the Araki, successive lords including the Ikeda clan and Miyoshi Nobuyoshi (Toyotomi Hidetsugi) took control. From around 1582, Yamazaki Katsuie from Omi Province entered with 22,000 koku, and his son Yamazaki Iemori became castle lord, establishing the outlines of an early modern castle.

Early Edo Period Transitions

After the Battle of Sekigahara (1600), the Sanda area was reorganized under Tokugawa-aligned daimyo. In 1601, Arima Noriyori entered with 20,000 koku, governing for approximately twenty years. He was followed by Matsudaira Shigenao (entered 1626, 30,000 koku), who transferred to another domain just seven years later in 1633. His replacement was Kuki Hisataka, who was transferred from Toba Castle in Shima Province with 36,000 koku, establishing the Kuki clan's long rule over Sanda.

The Kuki Clan's Rule (1633–1871)

From 1633 until the abolition of domains (haihan chiken) in 1871, the Kuki clan governed Sanda for approximately 240 years. The Kuki family had originally gained fame as naval warlords (suigun) from Shima Province in Ise — the famous "Kuki Navy" had fought prominently in Toyotomi Hideyoshi's Korean campaigns. Relocated to inland Sanda, the clan shifted their focus to agricultural administration and domain governance.

The Sanda fortification was not formally recognized as a "castle" (shiro) by the Tokugawa shogunate and was instead designated a "garrison" (jin'ya). This was typical under Tokugawa castle restriction policies, even for daimyo of moderate rank. The main enclosure of the garrison measured approximately 100 by 150 meters in a rectangular layout, divided by dry moats (karabori) — one on the east and two on the west — with earthen ramparts providing the primary defense.

Under Kuki administration, Sanda developed as a castle town with active commerce and agriculture. In the late Edo period, pro-imperial (sonnō jōi) sentiment grew within the domain, and the Kuki navigated the transition through the Meiji Restoration, surrendering their domain status in the return of lands and registers (hanseki hōkan, 1869) and the abolition of domains (1871).

Connections to Swords and Arms

As descendants of the Kuki suigun naval warriors, the Kuki clan who governed Sanda maintained a strong martial culture centered on swordsmanship. Swords and weapons collected or commissioned by successive Kuki domain lords are believed to survive in the Kuki family collection. Naval warfare traditions of the Kuki suigun period included specific preferences for shorter blades — tanto and wakizashi — suited to close combat aboard ships, and these preferences are documented in clan records.

During the turbulent Sengoku period at Sanda Castle, the rapid succession of castle lords — Araki, Yamazaki, Arima, Matsudaira — would have involved repeated movement and seizure of arms and swords. Settsu Province was historically a productive region for ironworking, and smithing activity in the Sanda area is documented.

Current State

The Sanda Castle ruins are incorporated within the grounds of Hyogo Prefectural Arima High School (secondary enclosure) and Sanda City Sanda Elementary School (main enclosure); no castle structures survive. Stone markers within and around the school grounds commemorate the castle's presence. Portions of the inner moat (uchiboriseki) survive and allow visitors to sense the former castle's layout. The "Black Gate" (Kuromono), one of the castle's original gates, has been relocated to Konshinin Temple and can be viewed there. The graves of successive domain lords are preserved at Shingetsuin Temple.