Ōkubo Nagayasu

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In this Japanese name, the family name is Ōkubo.

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Okubo Nagayasu (大久保長安, Okubo Nagayasu^?) (1545-June 13, 1613) was a Japanese samurai of the Edo period who served the Tokugawa clan. As Nagayasu was the son of a certain sarugaku player to the Takeda, it is speculated that he initially became a retainer to his father's respective lord around the time at which he was eligible for service, forthwith gaining a reputation as an at least moderately skilled administrator. Following the Takeda's death in 1582, Nagayasu had passed on his retainership to Tokugawa Ieyasu and held the title 'Commissioner of Mines' by the year of 1590, providing evidence that he was a needed figure to the Tokugawa, but at the same time regarded as a man of untrustworthiness, speculated by many for being fraudulent in his field. Nonetheless, Nagayasu was later awarded with a 30,000-koku fief at Hachijo of Musashi Province; and by the beginning of the Edo Period--specifically in 1606--he was made Daikan of Izu, where he subsequently held full delegation over that province's distribution of taxes and finances. After holding such a title and position for some time, Nagayasu had become known by many as 'Tenka no Sodaikan', or literally 'Great Administrator of the Realm', which needless to say made him an important political figure of the shogunate and earned him a majority length of respect among the populace. However, by means more than likely justified by illegal or conspiratory activity, Nagayasu would be involved in a bitter feud with Civil Administrator Honda Masazumi, causing the subsequent breaking down of the Okubo family and the worsening of their mutual fortunes. As Nagayasu had died by the year of 1613, the illegal activities that Nagayasu had theoritically taken part in became concreted evidence against his case; but as he was already dead by this time, his family was harshly punished in consequence.