Gotō Koreaki served as a bushō in Hizen Province during the Sengoku period. His common name was Yajirō. His formal wife was the daughter of Hirai Tsuneharu, the lord of Suko Castle in Hizen.
Koreaki was born as the second son of Matsura Takanobu of the Hirado-Matsura clan. In 1560, Koreaki was adopted by Gotō Takaakira, a landowner in Takeo. At the time of Koreaki’;s adoption, Takaakira did not have a natural son and heir. Meanwhile, owing to conflict with the main branch of his clan known as the Aikōnoura-Matsura, Takanobu tendered Koreaki for adoption by the Gotō as a means to obtain their support.
In 1562, however, Takaakira’s natural-born son, Haruaki, was born. Furthermore, in 1563, the Aikōnoura-Matsura clan surrendered to the Hirado-Matsura clan. As a result, the reasons for Koreaki’s adoption were extinguished, thereby diminishing his standing within the Gotō family.
On 6/23 of Tenshō 2 (1574), Koreaki finally rebelled against Takaakira. Initially, he ousted Takaakira from his base, but Takaakira called upon Ryūzōji Takanobu for support, tendering his own son, Haruaki, as a hostage. Koreaki’s forces were then attacked by the Ryūzōji and, on 9/16, surrendered. Having completely lost his position in the Gotō family, Koreaki fled for the protection of his original home with the Hirado-Matsura family, severing the relationship with the Gotō that had been formalized through his earlier adoption.
After returning to his original home, Koreaki led a secluded life in Hiu. According to historical records, Koreaki constructed the Shiratake Shrine in Sasebo.