Lifespan: Eiroku 6 (1563) or Eiroku 9 (1566) to 10/26 of Kanei 18 (1641)
Name Changes: Ryūzōji Iehisa → Taku Yasutoshi
Other Names: Nagato
Clan: Ryūzōji, Taku
Lord: Ryūzōji Takanobu → Ryūzōji Masaie → Ryūzōji Takafusa → Nabeshima Katsushige
Father: Ryūzōji Naganobu
Mother: Daughter of Oda Masamitsu
Siblings: Yasutoshi, sister (wife of Gotō Ietada), Shinkōin
Wife: Chizuru (second daughter of Nabeshima Naoshige)
Children: Shigetoki, Isekiku
Taku Yasutoshi served as a bushō during the Azuchi-Momoyama and early Edo periods. He was a retainer of the Ryūzōji and Nabeshima clans and served as the first head of the Taku-Nabeshima family.
In 1563 or 1566, Yasutoshi was born as the son of Ryūzōji Naganobu. His original name was Ryūzōji Iehisa. He became the first head of the hamlet of Taku in Hizen Province and adopted the name of Taku Nagato Yasutoshi. His formal wife was Chizuru, the second daughter of Nabeshima Naoshige.
Yasutoshi participated in the Bunroku-Keichō Campaign on the Korean Peninsula. While returning from Korea, he brought craftsmen of porcelain to Taku including Yi Sam-peyong and founded the manufacture of porcelain in Hizen known as imariyaki.
At the Battle of Sekigahara, although he obeyed his lord’s family by joining the Western Army, he sent large quantities of rice to Tokugawa Ieyasu. In 1607, upon the death of Ryūzōji Takafusa, the lineage of the main branch of the Ryūzōji clan came to an end. After the Nabeshima clan succeeded the Ryūzōji, Yasutoshi served in important roles for the clan, receiving the same level of treatment as family members and overseeing development projects for the Saga domain.
In 1634, Takafusa’s illegitimate son named Hakuan changed his name to Ryūzōji Sueaki and claimed to Tokugawa Iemitsu, the third shōgun of the Edo bakufu, that the Saga domain should be governed by the Ryūzōji clan instead of their successors, the Nabeshima. At this time, Yasutoshi was in attendance and stated: “If Sueaki, as an illegitimate son, is entitled to inherit the clan, then I myself am a more suitable choice” and further asserted to the bakufu that continued governance by the Nabeshima was justified, to which the bakufu agreed.
In 1641, Yasutoshi died and was succeeded by his adopted son, Taku Shigetoki (the son of Gotō Shigetomi). He also had an adopted daughter named Isekiku (wife of Kumashiro Tsunetoshi).