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| Castles in Kagawa Prefecture | |
|---|---|
| Name | Castles in Kagawa Prefecture |
| Location | Kagawa Prefecture, Shikoku, Japan |
| Coordinates | 34°20′N 134°02′E |
| Type | Japanese castles, yamajiro, hirajiro, hirayamajiro |
| Built | Sengoku period, Muromachi period, Edo period |
| Condition | ruins, reconstructed tenshu, foundations, earthworks |
Castles in Kagawa Prefecture Kagawa Prefecture on Shikoku hosts a concentration of Japanese feudal fortifications reflecting ties to Seto Inland Sea maritime networks, the Sengoku period, and the Tokugawa shogunate. Many sites connect to prominent clans such as the Matsudaira clan, Mori clan, Chōsokabe clan, Ikoma clan, and figures including Kagawa Kagekiyo and Kōno Michinao. Archaeological work links these castles to campaigns by Toyotomi Hideyoshi, the Sakai clan, and the post-Sekigahara rearrangements under Tokugawa Ieyasu.
Kagawa houses hilltop forts and plains castles reflecting regional feudal politics centered on Takamatsu and the maritime ports of Marugame and Kan'onji. The prefecture's fortifications include surviving towers like the reconstructed Marugame Castle tenshu, extensive stone walls at Takamatsu Castle (Sanuki) and earthen cities at Takamatsu Castle (Iyo) and Yashima. Strategic proximity to Great Seto Bridge routes and the Seto-Ōhashi Line influenced castle placement alongside domains such as Sanuki Province and neighbors Okayama Prefecture and Ehime Prefecture.
Medieval fortification in Kagawa evolved from Muromachi period fortified residences tied to the Hosokawa clan and Kagawa clan into Sengoku-era strongholds contested by Chōsokabe Motochika, Oda Nobunaga allies, and supporters of Toyotomi Hideyoshi. The Battle of Sekigahara and the establishment of the Tokugawa shogunate led to domain reorganizations affecting Marugame Domain, Takamatsu Domain, and Kagawa Domain subsidiary holdings administered by Matsudaira Tadateru and Ikoma Takatoshi. Edo-period peace under Sankin-kōtai stabilized castle towns connected to the Tosa Domain and Awa Province trade networks.
Marugame Castle — a surviving Edo-period tenshu reconstructed under the Kyōhō reforms, associated with the Matsudaira clan and site of festivals linked to Uchimura Kanzo commemorations. Takamatsu Castle (Sanuki) — coastal hirajiro notable for its seawater moats, connected to Ikoma Chikamasa and later to Matsudaira Sadanobu administrative reforms. Yashima — a yamajiro ridge fortress central to the Genpei War narrative, associated with Minamoto no Yoritomo legends and the Taira clan. Kannonji Castle — an inland stronghold tied to Kagawa Kagenobu and contested during campaigns by Chōsokabe Motochika and Sakai Tadatsugu. Sanuki Castle ruins — archaeological remains linked to the Ouchi clan and shipping controls on the Seto Inland Sea. Other sites: Takamatsu Castle (Iyo) ruins, Sakaide fortifications, Kotohira shiro remnants, Hiketa Castle ruins, Amagase Castle earthworks, Hōjō-style outworks in Zentsūji region, and numerous jōkamachi vestiges tied to Takamatsu Domain, Marugame Domain, and Kagawa samurai lineages.
Kagawa castles display variation from yamajiro mountain works to hirajiro seacoast complexes featuring seawater moats like Takamatsu Castle (Sanuki) and stone-faced slope constructions exemplified by Marugame Castle stone walls influenced by techniques seen in Osaka Castle and Himeji Castle. Timber tenshu, multi-storied keeps, yagura watchtowers, masugata gates, and wet and dry moats reflect influences from Sengoku fortification manuals and Edo-period standards promoted by Ii Naosuke-era administration. Landscaping around shrines such as Konpira Shrine intersected castle-town planning, while defensive terraces and kuruwa enclosures mirror practices recorded in Gunshi and regional treatises.
Several sites hold Important Cultural Property status or Historic Site designation under national laws administered by the Agency for Cultural Affairs (Japan), while local boards like the Kagawa Prefectural Board of Education and municipal heritage committees manage conservation. Reconstructions—such as the Marugame tenshu—are guided by studies from institutions including Tokyo National Museum, Kyoto University archaeology departments, and the National Research Institute for Cultural Properties, Tokyo. Designation processes reference precedents set by protection measures for Himeji Castle and Nijō Castle and integrate UNESCO discussions following World Heritage conservation debates.
Castle sites in Kagawa are accessible via regional transport nodes: Takamatsu Station on the Yosan Line, JR Shikoku services, ferries across the Seto Inland Sea, and roadways linking the Great Seto Bridge and national routes. Visitor centers provide exhibits curated by the Kagawa Prefectural Museum of Cultural History and guided tours often coordinated with events like the Shikoku Pilgrimage season and local festivals at Kotohira-gū. Nearby amenities include accommodations in Takamatsu, visitor information at Marugame City Hall and museum partnerships with Ritsumeikan University outreach programs.
Ongoing excavations conducted by Kagawa University, Okayama University Department of Archaeology, and collaborative teams from National Museum of Japanese History publish findings in journals such as Bulletin of the National Museum of Japanese History and proceedings of the Japanese Archaeological Association. Studies focus on stratigraphy of stone walls, dendrochronology of tenshu timbers, pottery assemblages linked to Seto ware kilns, and GIS mapping that correlates castle networks with medieval shipping lanes documented in Nihon Shoki-era chronicles and Sengoku campaign records involving Toyotomi Hideyoshi and Chōsokabe Motochika.