Nirayama Daikansho

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The Nirayama daikansho (韮山代官所) was an Edo period administrative center for the tenryō territories in eastern Japan under the direct control of the Tokugawa shogunate. It was located in what is now part of the city of Izunokuni in the Tōkai region of Japan. There were once many daikansho located in various parts of Japan serving a similar function, and this is one of the few which remains relatively intact. It was designated a National Historic Site of Japan in 2004. The Nirayama daikansho administered all of Izu Province (which was completely tenryō territory), as well as large portions of Suruga, Sagama and Musashi Provinces, as well as a portion of Kai Province and the Izu islands. Its kokudaka fluctuated at several points in its history, but was estimated to be at around 50,000 to 100,000 koku. The office of daikan was hereditary to the Egawa clan (except for a period from 1723 to 1758), and was regarded as equivalent to that of a hatamoto. The head of the Egawa clan always took the name of Egawa Tarō Uzaemon. The Egawa were a samurai clan who claimed descent from the Seiwa Genji who controlled central Izu since the Heian period. Similar to the daimyō, they also maintained a residence in Edo (located in Honjō).