Lifespan: Kanshō 6 (1465) to 6/8 of Daiei 4 (1524)
Title: Governor of Shimōsa
Lord: Uesugi Akisada → Uesugi Akizane
Father: Nagao Tadakage
Adoptive Father: Narita Shōtō
Siblings: Nagao Akitada, Nagao Sadaaki, Akiyasu, Nagao 景致
Narita Akiyasu served as a bushō from the late Muromachi to Sengoku periods. He was a retainer of the Yamauchi-Uesugi family.
Akiyasu was born as the third son of Nagao Tadakage, the fifth head of the Sōja-Nagao clan. Nagao Kagetada (Zaemon) was the seventh head of the Nagao clan from the Nanboku to early Muromachi periods. In the era of Kagetada’s grandchildren, the Nagao clan of Kōzuke Province split between the Shiroi-Nagao branch based in Shiroi and the Sōja-Nagao branch based in Sōja.
Akiyasu was adopted by Narita Shōtō. In 1480, his adoptive father retired and he inherited the headship of the Narita clan. Akiyasu served the Yamauchi-Uesugi family. Around 1497, he received one of the characters from the name of Uesugi Akisada, the deputy shōgun of the Kantō, and adopted the name of Akiyasu.
Accompanying the revival of the Ōta clan, in 1509, he moved to Oshi Castle, a stronghold counted as one of the Seven Castles of the Kantō (along with Kawagoe, Maebashi, Nitta-Kanayama, Karasawayama, Utsunomiya, and Taki castles). Oshi Castle was built in the late Muromachi and early Sengoku periods by the Narita clan and was located in Oshi in the Saitama District of Musashi Province.
During the Eishō Incident, Akiyasu joined his nephew, Nagao Akikata, to serve Ashikaga Masauji (the Koga kubō) and Uesugi Akizane (the deputy shōgun of the Kantō) in battle against Yokose Kageshige and Nagao Kagenaga, but was defeated and surrendered to Uesugi Norifusa as the new deputy shōgun of the Kantō.
Akiyasu died in 1524. He was succeeded by his son, Narita Chikayasu.
According to genealogical charts from the Narita clan, he died in 1484, while his eldest son, Narita Chikayasu, died in 1524. Recent research shows that accounts of the date of the demise of successive heads of the Narita clan were off by a generation.