Oshi Domain

Oshi Domain (忍藩, Oshi-han^?) was a feudal domain under the Tokugawa shogunate of Edo period Japan, located in Musashi Province (modern-day Saitama Prefecture), Japan. It was centered on Oshi Castle in what is now part of the city of Gyōda, Saitama.

Oshi Castle was completed by Narita Akiyasu around 1479. The Narita family ruled over the area of Gyōda as retainers to the Odawara Hōjō clan. The castle made use of marshes and swamplands in its surroundings and was considered impregnable. In 1590, Toyotomi Hideyoshi dispatched his senior retainer Ishida Mitsunari with an army of 23,000 troops to seize the castle. In the Siege of Oshi, the castle’s 619 samurai and 2000 local conscripts held off numerous attacks, and the castle surrendered only after word that their overlords had been defeated at the Siege of Odawara.

Afterwards, the area came under the control of Tokugawa Ieyasu, who assigned his 4th son, Matsudaira Tadayoshi to a 100,000 koku domain. However, as Tadayasu was only 11 years old, the domain was managed by Matsudaira Ietada, who repaired the battle-damaged castle and surrounding castle town until 1592. He was replaced by Matsudaira Tadayoshi of the Tōjō-branch of the Matsudaira clan until 1600. However, following the Battle of Sekigahara, Matsudaira Tadayoshi was promoted to Kiyosu Domain (620,000 koku) and Oshi Domain reverted to tenryo status.

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