Lifespan: 15xx to 16xx
Clan: Saka → Gamō
Lord: Seki Narishige → Shibata Katsuie → Gamō Ujisato → Gamō Hideyuki → Ishida Mitsunari → Gamō Hideyuki → Tōdō Takatora → Gamō Tadasato → Gamō Tadatomo
Father: Gamō Satonari
Siblings: Satonobu, Satoie
Gamō Satoie served as a bushō from the Sengoku to early Edo period. Satoie served as a retainer of the Gamō clan and, over the course of his life, a multitude of lords.
Satoie was born as the son of Gamō Satonari (under another theory, Satonari was his older brother). He originated from Owari Province and was known under the name of 坂源 Hyōe. His father, Satonari, came from the Saka clan, and after serving Seki Narishige and Shibata Katsuie, entered into service for the Gamō clan. After making contributions at the Subjugation of Kyūshū, he was permitted to adopt the Gamō surname and the name of Satoie. When his lord, Gamō Ujisato, was assigned to Aizu in Mutsu Province, Satoie and his father, Satonari, were granted Shiroishi Castle and a fief of 40,000 koku. Following the death of Ujisato, friction arose between senior retainers under Ujisato’s successor, Gamō Hideyuki, escalating into armed conflict in an event known as the Gamō Disturbance. As a result, the Gamō family could no longer control assorted daimyō in the Tōhoku Region, and were reassigned to Utsunomiya in Shiomotsuke Province with a reduction in their fief from 920,000 koku in Aizu to 180,000 koku in Utsunomiya. Leaving behind Satonari (his father) and Satonobu (his older brother), Satoie fled the Gamō family and became a rōnin, or masterless samurai, eventually serving Ishida Mitsunari.
After the Battle of Sekigahara in the ninth month of 1600, Satoie returned to the service of the Gamō family remaining under his father and older brother. Thereafter, in the wake of a quarrel with the chief retainer named Oka Shigemasa, Satoie, along with his father and older brother, fled, and served Tōdō Takatora, a daimyō based in Imabari in Shikoku who received an increase to his fief as a result of siding with the Eastern Army at the Battle of Sekigahara.
In 1612, Hideyuki suddenly died at the age of thirty and was succeeded by his eldest son, Gamō Tadasato, at the age of ten. Hideyuki’s widow, Furihime (the third daughter of Tokugawa Ieyasu) served as his guardian. She then came into a severe conflict with Oka Shigemasa over matters of governance of the domain which culminated in her father, Ieyasu, summoning Shigemasa to Sunpu Castle and ordering him to commit seppuku. Thereafter, Satoie, along with Satonari (his father) and Satonobu (his older brother), returned to the service of the Gamō family upon request of Tadasato. Satonari died of illness en route to Aizu to return to service, so Satonobu received a fief of 30,000 koku while Satoie received Miharu Castle and a fief of 15,000 koku. However, owing to confrontation with a senior retainer named Machino Yukikazu, the brothers were expelled from the Gamō family. Following the later demotion of Yukikazu, the brothers returned to the family, but, once again, Satoie was expelled by his lord, Gamō Tadatomo. The year of his death is unknown.