was a retainer of Satsuma daimyà  Shimazu Yoshihisa. He is also known as Jiroshirà Â. He served under Shimazu Takahisa and then under Yoshihisa. Tadamoto was a skilled samurai called Oni Musashi.
Tadamoto had an active role at the Battle of Kizaki (1572), and, in 1574, became a hostage to compel the surrender of an enemy commander who had held-out in Ushine Castle for over one year. Tadamoto joined in the Siege of Minamata Castle (1581), and at the Battle of Okitanawate (1584). He was given à Âguchi region and was a commander of the à Âguchi Castle.
He also participated in the Kyushu Campaign against Toyotomi Hideyoshi. At the Battle of Sendaigawa, Niiro led his men in a charge against the Toyotomi force, and even engaged the famous warrior Katà  Kiyomasa in personal combat before retreating under cover of night. He did not surrender to Hideyoshi until after the surrender of Shimazu Yoshihiro, the younger brother of Shimazu Yoshihisa.