Sekiyado Castle
| Sekiyado Castle 関宿城 |
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| Noda, Chiba Prefecture, Japan | |
Reconstructed Main Keep of Sekiyado Castle
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| Coordinates | Coordinates: 36°05′48.34″N 139°46′48.61″E / 36.0967611°N 139.7801694°E |
| Type | flatland-style Japanese castle |
| Site information | |
| Owner | reconstructed 1995 |
| Open to the public |
yes |
| Site history | |
| Built | 1590 |
| Built by | Matsudaira Yasumoto |
| In use | Edo period |
| Demolished | 1875 |
Sekiyado Castle (関宿城 Sekiyado-jō?) is a Japanese castle located in Noda, northwestern Chiba Prefecture, Japan. At the end of the Edo period, Sekiyado Castle was home to the Kuse clan, daimyō of Sekiyado Domain.
Sekiyado is located at the confluence of the Tone River and the Edogawa River, and was thus a strategic location controlling river traffic in the northern Kantō region, as well as the northeastern approaches to Edo. A fortification was built on this location in the early Muromachi period by either Yadoya Mitsusuke (1395-1438) or Yadoya Shigesuke (d. 1512). It was destroyed during a campaign by the Late Hōjō clan of Odawara to conquer the Kantō region from 1565-1574.
After the Hōjō clan was destroyed in the Battle of Odawara, they were supplanted by Tokugawa Ieyasu, the castle was reconstructed by Matsudaira Yasumoto in 1590.
Under the Tokugawa Shogunate, the course of the Tone River was diverted in 1654 to prevent flooding in Edo. The new mouth of the Tone River was moved from Edo Bay to north of the Bōsō Peninsula, which greatly hindered river transportation. The daimyō of Sekiyado Domain, Itakura Shigetsune, took advantage of this situation to construct a canal joining the Tone River with the Edogawa River at Sekiyado, which greatly shortened the voyage and enhanced the revenues of his domain.
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