Sado, Niigata

is a Japanese city on in Niigata Prefecture.
History.
Uesugi Kagekatsu took control of the island in the late 1580s.
In the Edo period, gold was discovered on the island. The Tokugawa shogunate took direct control of it. It was administered by an official called the Sado-bugyō. Okubo Nagayasu was appointed to this position by Tokugawa Ieyasu in 1603.
In the Meiji period, the island became part of Niigata Prefecture.