Fukunaga Sukeaki served as a bushō during the Sengoku period.  He was a retainer of the Itō clan of Hyūga Province.

His lord, Itō Tadasuke, became enamored with Sukeaki’s daughter, and she bore Itō Sukemitsu, Itō Sukekiyo, and Itō Sukeyoshi, making Sukeaki a maternal grandfather to Tadasuke’s sons.  Sukeaki became a chief retainer of Tadasuke in the Hyūga-Itō family.  After his death, Tadasuke was succeeded by his son, Sukemitsu, who was still young at the time that he became the ninth head of the clan.  Sukemitsu exhibited despotic tendencies such that he was viewed as wielding a level of authority unmatched by anyone else in the province.  This led to a serious conflict with his hereditary band of retainers.

In particular, the Inazu and Ochiai clans strongly opposed having the Mera clan, landlords of Ogawa in the mountainous areas, become servants of the Itō.  In 1531, this dispute escalated into a battle against an uprising by a group referred to as the wakashū below Tonokōri Castle.  Acting under the authority of his lord and in the name of the military governor, Sukeaki firmly suppressed the uprising.  As a result, the Itō clan lost many talented bushō including Ochiai Kaneyori, Inazu Shigeyoshi, Migimatsu Sukenobu, and Kawasaki Yoshishiro.

The removal of opposition elements in this manner appeared to have bolstered Sukeaki’s authority.  In 1533, however, after the early death from illness of Sukemitsu, Itō Suketake (Tadasuke’s younger brother) revolted, forcing Sukeaki and his three sons to kill themselves and then occupied Tonokōri Castle.  This owed, at least in part, to Suketake’s resentment toward Suekaki for his high-handed conduct of affairs of the clan.