Tokugawa Ieyasu's mine magistrate died rich in 1613, and the shogunate made his seven sons kill themselves and seized everything he owned

Ōkubo Nagayasu was born in 1545, the second son of a sarugaku performer. Takeda Shingen took him on as a retainer and set him to work on mines and taxes, including the Kurokawa gold mine. After Tokugawa Ieyasu took the Iwami silver mine in 1600, he put Nagayasu in charge of it. Nagayasu opened new shafts, one of them named after him, and is credited with the mine's greatest years. Ieyasu gave him the Sado gold mines in 1603 and the Izu mines in 1606, and the administration of a large part of Ieyasu's own lands. Before he died he built several tombs as monuments. He had a stroke in 1612 and died on 13 June 1613, aged 69. Questions then arose about wealth he had taken from the mines. His sons refused to submit to an audit. In the seventh month of 1613 seven of his sons were ordered to commit seppuku. Many followers were also forced to kill themselves. His whole estate was seized, and lords linked to him lost their domains. He was charged after death with embezzlement and treason. His monuments were removed or left to decay. In 1794 the people of Iwami Ginzan put up a new tombstone for him. It still stands in Ōda.