Ōoka clan

Ōoka
Ōoka clan crest
Home province	Mikawa
Parent house	Fujiwara clan
Titles	daimyō, viscount
Founder	Ōoka Tadakatsu
Final ruler	Ōoka Tadataka
Founding year	Kamakura period
Dissolution	still extant
Ruled until	1873 (Abolition of the han system)

The Ōoka clan (大岡氏, Ōoka -shi^?) were a samurai kin group which rose to prominence in the Edo period. Under the Tokugawa shogunate, the Ōoka, as hereditary vassels of the Tokugawa clan, were classified as one of the fudai daimyō clans.

The Ōoka claimed descent from the Kamakura Period kampaku Kujō Tadanori, settling in Ōoka Village in Yana District of northern Mikawa Province (in what is now part of the city of Shinshiro, Aichi. During the Sengoku period, Ōoka Tadato (1522–1594) was a general in the armies of Matsudaira Hirohada during the Battle of Azukizaka (1564). His son Ōoka Tadamasa (1548–1629) subsequently accompanied Tokugawa Ieyasu to the Kanto region and was given a small 220 koku holding in Kōza District of Sagami Province, which he gradually built up into 600 koku in what is now part of the city of Hiratsuka, Kanagawa. His descendants continued to assist the Tokugawa shogunate as hatamoto.

The clan’s fortunes went into eclipse when Ōoka Tadashina (1667–1710) so displeased Shogun Tokugawa Tsunayoshi that he was exiled to Hachijojima and Ōoka Tadafusa (1650–1696) was forced to commit seppuku for killing a retainer of the Shimazu clan in a brawl.