Ōkubo Nagayasu

Ōkubo Nagayasu (1545–1613) served Tokugawa Ieyasu. Concurrently holding posts such as daikan-gashira, Sado bugyō and Iwami bugyō, he was in charge of managing the shogunate's directly administered mines, including the Sado Gold Mine, the Iwami Silver Mine and the Izu Gold Mine, and was a figure who generated enormous wealth. He is said to have originally been the son of a sarugaku performer, but he served Takeda Shingen, distinguished himself as a financial administrator, and was later discovered by Ieyasu. He oversaw the mining, refining technology and circulation of gold and silver, and his achievement in establishing the shogunate's fiscal foundation was immense. After his death, suspicions of hoarding wealth led to the “Ōkubo Nagayasu Incident,” which extended to the Ōkubo clan.