Lifespan: 15xx to 12/29 of Tenshō 9 (1582)
Title: Governor of Echizen
Lord: Ōtomo clan → Shimazu clan
Father: Jō Chikafuyu
Siblings: Chikamasa, Chikamoto, Takafusa
Children: Fuyumoto (Hisamoto), Takefusa
Jō Chikamasa served as a bushō during the Azuchi-Momoyama period. Chikamasa first served as a retainer of the Ōtomo clan and, later, as a retainer of the Shimazu clan.
The Jō clan were members of the Kikuchi family originating from the village of Jō in the Yamaga District of Higo Province. From the era of his father, Jō Chikafuyu, the Jō served as the lords of Kumamoto Castle. As the eldest son, Chikamasa inherited the role as lord of the castle. In 1578, at the Battle of Mimikawa, Ōtomo Yoshishige was defeated by the forces of Shimazu Yoshihisa, leading to the decline of the Ōtomo clan. The Kumabe clan joined with the Ryūzōji clan to strengthen their position. Threatened by an expansion of the Ryūzōji into Higo, Chikamasa switched his allegiance from the Ōtomo to the Shimazu clan. In 1580, he executed a plan with the Shimazu forces in Higo, fighting against Kai Sōun, but was defeated. In 1581, he capitulated to an invasion by the Ryūzōji of Hizen and died at the end of the year.