Lifespan: Tenshō 2 (1574) to 10/9 of Keichō 17 (1612)
Other Names: Yoshitoshi, Hachibei (common), Ishino Ujioki
Clan: Akamatsu → Ishino
Lord: Tokugawa Ieyasu
Father: Akamatsu Ujimitsu
Mother: Daughter of Arima Noriyori
Siblings: Ujioki, Ujitsugu, Masanao
Wife: Daughter of Naitō Ienaga
Children: Ujiteru, Ujinobu
Akamatsu Ujioki served as a bushō during the Azuchi-Momoyama period and as a hatamoto during the early Edo period. He was a descendant of the Shichijō, an illegitimate branch of the Akamatsu clan, a well-known shugo daimyō family. Ujioki adopted the surname of the Ishino clan.
During his childhood, Ujioki was raised by his maternal grandfather, Arima Noriyori, a damiyō who, in the Edo period, served as the lord of the Sanda domain in the Arima District of Settsu Province. After his coming-of-age ceremony, he emulated a name formerly used by the lineal branch of the Akamatsu clan by adopting the name of Yoshitoshi.
In the seventh month of 1592, through the introduction of Noriyori, Ujioki met with Tokugawa Ieyasu while Ieyasu was on deployment at Nagoya Castle. Ieyasu then engaged him as a servant.
In 1595, Tokugawa Ieyasu granted Ujioki a fief of 2,150 koku in the Amaha and Sue districts of Kazusa Province. In addition, Ujioki occupied the Shimoyue encampment located between Kimitsu and Futtsu in Kazusa. Ujioki first served as an attendant of Ieyasu, later becoming a hatamoto, or direct retainer of the Edo bakufu. Thereafter, his descendants served as hatamoto until the Meiji period.
In 1600, at the Battle of Sekigahara, Ujioki served as a scout and, owing to his contributions, he was awarded 1,000 koku in Shuzenji in Izu Province. In 1601, he became a tsukaiban, or inspector, on behalf of the Edo bakufu.
In 1612, Ujioki died in Sunpu at the age of thirty-nine. He was succeeded by his designated heir, Akamatsu Ujiteru. His second son, Akamatsu Ujinobu, served Tokugawa Yorifusa of the Mito domain.