 His childhood name was first , and then .In 1837, he was adopted as Date Narikuni’s official successor, taking the name of Date Toshimura.Early the following year, at age 14, he had his coming-of-age ceremony in Edo Castle, and was received in formal audience by the "shōgun" Tokugawa Ieyoshi, who bestowed upon him the "yoshi" "kanji" from his name, thus becoming Date Yoshitoshi, and receiving the courtesy titles of "Chikuzen-no-kami" and "jijū" (chamberlain).