Lifespan: Eikyō 7 (1435) to 2/12 of Kanshō 7 (1466)
Other Names: Tatsuharu (childhood), Hachirō (common)
Rank: bushō, shugo daimyō
Title: Assistant Vice-Minister of the Military
Bakufu: Muromachi – Deputy shōgun of the Kantō
Lord: Ashikaga Yoshimasa
Father: Uesugi Norizane
Siblings: Noritada, Fusaaki, Shūsei, Hōkō, Shūtai
Children: Daughter (second wife of Utsunomiya Masatsuna)
Adopted Children: Akisada (second son of Uesugi Fusasada)
Uesugi Fusaaki served as a bushō and shugo daimyō during the middle Muromachi period. He was the tenth head of the Yamanouchi-Uesugi family and the deputy shōgun of the Kantō.
In 1435, Fusaaki was born as the second son of Uesugi Norizane. Norizane prevailed against Ashikaga Mochiuji (the Kamakura kubō) in the Eikyō Conflict in 1438 and against the Yūki and other gōzoku, or wealthy families, in the Kantō in the Battle of Yūki in 1440. Meanwhile, with the exception of Fusaaki, Norizane had all of his children enter the priesthood.
Fusaaki was kept for a while under his cousin, Uesugi Fusatomo, the military governor of Echigo Province, but, in 1444, he was granted by his father landholdings in Echigo and Tanba provinces. After going to the capital, he served as an attendant of Ashikaga Yoshimasa, the eighth shōgun of the Muromachi bakufu.
On 12/27 of Kyōtoku 3 (1455), after his older brother, Uesugi Noritada, was assassinated by Ashikaga Shigeuji, the fifth Kamakura kubō, for reasons that he was Noritada’s younger brother and other details, in the third month of 1455, Fusaaki was newly appointed as the deputy shōgun of the Kantō. As the general of Shigeuji’s army, he went from the capital to the Kantō and, around the fourth month, entered Hirai Castle in Kazusa Province. This occurred in connection with the Kyōtoku War.
Following Shigeuji’s move of his base from Kamakura to Koga, Fusaaki clashed with his forces numerous times but, in 1459, at the Battle of Ōta-no-shō in Musashi Province, he suffered a major defeat to Shigeuji’s army. In 1463, Nagao Kagenaka, the head of house affairs for the Yamanouchi-Uesugi family who was Fusaaki’s righthand man, died of illness, after which Fusaaki expressed a desire to retire from his position as the deputy shōgun of the Kantō, but was rejected by the bakufu. In 1466, Fusaaki died while on deployment for the Irako War. He was thirty-two years old. Uesugi Akisada, the child of Fusaaki’s cousin, became the next deputy shōgun of the Kantō.
Fusaaki’s multiple defeats contributed to the decline of the family of the deputy shōgun of the Kantō.