Shonai han

Shōnai Domain (庄内藩, Shōnai-han) was a feudal domain in Edo period Japan, located in Dewa Province (modern-day Yamagata Prefecture), Japan. It was centered on Tsuruoka Castle in what is now the city of Tsuruoka, Yamagata and was thus also known as the Tsuruoka Domain (鶴岡藩, Tsuruoka han). It was governed for the whole of its history by the Sakai clan, which resulted in an unusually stable and prosperous domain. During their rule over Shōnai, the Sakai clan was ranked as a Province-holding daimyō (国持ち大名, kunimochi daimyō) family, and as such, had the privilege of shogunal audiences in the Great Hall (Ohiroma) of Edo Castle. In the Boshin War of 1868–69, the domain joined the Ōuetsu Reppan Dōmei, the alliance of northern domains supporting the Tokugawa shogunate, but then later defected to the imperial side. As with all other domains, it was disbanded in 1871.

The Sakai rose to prominence with Sakai Tadatsugu, who was one of Tokugawa Ieyasu's Shitennō, or four leading generals and the daimyō of Matsushiro Domain in Shinano Province. After the death of Mogami Yoshiaki many internal struggles for control of the Mogami clan, the former rulers of Dewa Province, arouse and caused their vast domain to be divided into several parts. Sakai Tadatsugu was awarded the coastal region consisting of Tagawa, Akumi and Murayama districts, which increased his revenues from 38,000 koku to 138,000 koku, and then to 150,000 koku. However, the lands of the Shōnai region were fertile and well-watered, and eminently suited for growing rice, which gave the Sakai clan actual revenues of more than 200,000 koku. This revenue was further supplemented by the developed of Sakata port for the coastal kitamaebune trade, which gave the clan an actual income of closer to 300,000 koku.

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