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| Sakamoto Castle | |
|---|---|
| Name | Sakamoto Castle |
| Native name | 坂本城 |
| Location | Biwako region, Ōtsu, Shiga Prefecture |
| Type | Hirashiro (flatland) / Yamajiro (mountain) influences |
| Built | c. 1571 |
| Builder | Amano Takashige / Amano clan |
| Materials | Stone, wood, earthworks |
| Used | Sengoku period, Azuchi–Momoyama period |
| Demolished | c. 1583 (partial) |
| Condition | Ruins, reconstructed gate and moat sections |
| Events | Battle of Anegawa, Siege of Mount Hiei, Ikkō-ikki uprisings |
Sakamoto Castle Sakamoto Castle was a late-Sengoku period Japanese castle located on the shores of Lake Biwa near Ōtsu in Shiga Prefecture. Constructed in the 1570s amid the campaigns of Oda Nobunaga and contemporaries, the site played roles in conflicts involving Azai Nagamasa, Asakura Yoshikage, and Toyotomi Hideyoshi. The castle's remnants and reconstructed elements now form part of regional heritage in proximity to Hikone Castle and Azuchi Castle landmarks.
Sakamoto Castle's foundation is attributed to retainers aligned with Oda Nobunaga and the Amano clan during the volatile 1570s, a decade marked by the Battle of Anegawa, the Ikkō-ikki uprisings, and the consolidation of power by Oda Nobunaga against Azai Nagamasa and Asakura Yoshikage. Subsequent decades saw involvement by figures such as Toyotomi Hideyoshi, Akechi Mitsuhide, and local warlords tied to Ōmi Province politics, reflecting interactions with the Asai clan, the Rokkaku clan, and the provincial offices of Ashikaga shogunate heirs. During the transition to the Edo period the castle's strategic value declined as authoritative control shifted to Tokugawa Ieyasu and his vassals, paralleling the fate of nearby fortifications like Azuchi Castle and the administrative center at Otsu.
The castle combined flatland fortification concepts observable at other contemporary sites such as Azuchi Castle and Hikone Castle, integrating stone walls, earthworks, and timber buildings typical of late-Sengoku architecture promoted by master masons linked to Kiyosu and Kyoto workshops. Defensive features included concentric baileys, moats tapping into Lake Biwa's waterline, masugata-style gates influenced by Asakura and Rokkaku designs, and foundation stones reminiscent of techniques used at Echizen and Owari strongholds. Layout references show a central honmaru compound surrounded by ni-no-maru and san-no-maru enclosures, yagura turrets similar in plan to those at Nagahama Castle, and subsidiary baileys for storehouses and residences of samurai retainers attached to clans such as the Amano clan and allied families.
Situated on Lake Biwa's western littoral, the site controlled lakeborne supply routes between Kyoto, Otsu, and the Nakasendō corridor connecting Edo and Nagano regions, making it a focal point in campaigns involving Oda Nobunaga, Toyotomi Hideyoshi, and anti-Oda coalitions including Azai Nagamasa and Asakura Yoshikage. It saw action in the aftermath of the Battle of Anegawa and was implicated in suppression of Ikkō-ikki strongholds near Ishiyama Hongan-ji and the Enryaku-ji controversies culminating in the Siege of Mount Hiei. Naval skirmishes and logistics operations around the lake connected Sakamoto's fate to engagements involving commanders like Yamamoto Kansuke-era successors and regional lords such as the Niwa clan and Mōri clan allies.
Control of the castle passed among retainers and vassals tied to major daimyo of the era, including vassals to Oda Nobunaga and later administrators under Toyotomi Hideyoshi and Tokugawa Ieyasu realignments. Prominent figures associated with the site include members of the Amano clan, castellans appointed by Oda-aligned commanders, and local jizamurai families integrated into the power networks of Ōmi Province. Nearby aristocratic and religious centers such as Enryaku-ji and the provincial headquarters influenced appointments, while ties to families like the Asai clan and the Azai remnants are evident in contemporary records and land surveys.
The castle declined after military centralization under Toyotomi Hideyoshi and administrative reorganization under Tokugawa Ieyasu, with partial demolition occurring in the 1580s concurrent with the dismantling of satellite fortifications across Ōmi Province. Natural degradation, 17th–19th century urban development in Ōtsu, and policies of "one castle per domain" implemented by the Tokugawa shogunate further reduced its structures, mirroring losses at sites like Azuchi Castle and smaller lakeside forts. Preservation efforts in the modern era have focused on protecting surviving stonework, restoring a gate and moat segments, and designating remnants within regional cultural property frameworks administered by Shiga Prefectural Government and municipal heritage bodies.
Archaeological surveys uncovered foundation stones, earthen ramparts, and artifacts such as ceramic fragments, roof tiles comparable to shards from Azuchi Castle excavations, Edo-period documents preserved in archives like those related to Ōmi Province administration, and metal fittings consistent with late-Sengoku construction techniques. Excavations coordinated with institutions including Nagahama City Museum-style curatorial collaborations and university teams revealed stratigraphy linking the site to 16th-century occupation layers documented alongside finds from Ishiyama Hongan-ji and Enryaku-ji. Reconstruction projects have produced a reconstructed gate, interpretive signage, and reconstituted moat sections, drawing on methodologies used at reconstructions of Hikone Castle outbuildings and conservation practices advised by national cultural agencies.
Sakamoto Castle appears in regional historiography, local festivals in Ōtsu, and interpretive trails connecting sites like Azuchi Castle ruins and Hikone Castle parks, featuring in guidebooks alongside Lake Biwa tourism literature. The site and its legends surface in historical novels about Oda Nobunaga and Azai Nagamasa, television dramas produced by networks covering Sengoku period narratives, and academic monographs on Ōmi Province conflict archaeology. Its memory is preserved in municipal museums, heritage trails, and cultural events that link to broader representations of the late-Sengoku era involving personalities such as Toyotomi Hideyoshi, Akechi Mitsuhide, and clerical institutions like Enryaku-ji.
Category:Castles in Shiga Prefecture Category:Sengoku period