Mr. Okubo

The name of a Fudai Daimyo (feudal lord) and Hatamoto (shogun) in the Edo period. According to the family tree, they are descended from Fujiwara no Michikane and a branch of the Utsunomiya clan of Shimotsuke. They first went by the name of Utsunomiya or Utsu, but changed their name to Okubo during the time of Tadatoshi, who served Matsudaira Kiyoyasu, the grandfather of Tokugawa Ieyasu. Their relationship with the Tokugawa clan began after they became vassals of Matsudaira Nobumitsu, and they are considered Iwazu Fudai. For generations, they lived in the area around Kamiwada-go in Mikawa (Aichi Prefecture), and during the Mikawa Ikko Ikki uprising, the entire clan sided with Ieyasu. The main branch of the Okubo clan did not become a daimyo, but ended up as hatamoto, but three daimyo families came from the line of Tadashige's third son, Tadakazu. (1) is the Okubo clan of Odawara Domain, descended from Tadayo, who was a subordinate general of Ieyasu during the Tokugawa clan's period of possession of five provinces, and his son Tadachika, who became a powerful man during the Hidetada era but later fell from grace. At first, they received 45,000 koku of rice, but after Tadachika's fall, they were restored to 103,000 koku under Tadatomo. After that, they also held important positions in the shogunate. (2) is the Okubo clan of Karasuyama Domain in Shimotsuke Province, descended from Tadakane. (3) is the Okubo clan of Ogino Yamanaka Domain in Sagami Province, a branch of the Okubo clan of Odawara Domain. Both families were members of the shogunate, such as senior councilors and young councilors. Okubo Hikozaemon (Tadataka), famous for his storytelling, was Tadachika's uncle.

[Masuo Inorimoto]

Source: Shogakukan Encyclopedia Nipponica About Encyclopedia Nipponica Information | Legend

江戸時代の譜代大名(ふだいだいみょう)、旗本の氏名。系図上では藤原道兼(ふじわらのみちかね)流、下野(しもつけ)宇都宮(うつのみや)氏支流。初め宇都宮氏または宇津氏を名のり、徳川家康の祖父松平清康に仕えた忠俊(ただとし)のとき大久保氏に改名。徳川氏との関係は松平信光に臣属してからで岩津譜代とされる。代々、三河（愛知県）の上和田郷周辺に住み、三河一向一揆(いっこういっき)のときは一族とも家康に味方した。大久保氏の本宗は大名とならず旗本で終わったが、忠茂の三男忠員(ただかず)の系統から大名が3家出た。(1)は徳川氏の五か国領有期、家康の部将で活躍した忠世(ただよ)と、その子で秀忠(ひでただ)時代の実力者となりのち失脚した忠隣(ただちか)の系統の小田原藩大久保氏。初め4万5000石だが、忠隣の失脚後、忠朝(ただとも)の代にふたたび復帰し10万3000石。以後、幕府の重職にも就任。(2)は忠員の系統で下野烏山(からすやま)藩大久保氏。(3)は小田原藩大久保氏の支族の相模国(さがみのくに)荻野山中(おぎのやまなか)藩大久保氏である。両家とも老中、若年寄など幕閣に列する。講談で有名な大久保彦左衛門(ひこざえもん)（忠教(ただたか)）は忠隣の叔父。

［煎本増夫］

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