Background
He was the eighth son of Ōkubo Tadakazu, a vassal of the Tokugawa clan.
大久保 忠教大久保 彦左衛門
He was the eighth son of Ōkubo Tadakazu, a vassal of the Tokugawa clan.
Tadataka was born in Kamiwada, Mikawa Province, the son of Tokugawa retainer Ōkubo Tadakazu. He joined Tadayo at age 17 for his first campaign, during the subjugation of Tōtōmi Province. Tadataka"s first battle was the siege of Inui Castle.
He also fought at the siege of Ueda Castle.
After the Siege of Odawara, when Tokugawa Ieyasu moved to the Kantō Region, he granted Tadataka land assessed at 3,000 koku, and appointed him yari-bugyō (magistrate of spears) in the Tokugawa main battle camp. Tadataka also served at Sekigahara and the Siege of Osaka.
His service stretched over the careers of the first three Tokugawa shoguns. Tadataka died at age 80.
His graves are in Okazaki, Kyoto, and at Ryūgyō-ji, a temple in Minato, Tokyo.