In 1551, with his father, Yoshitoyo who was Shosanmi (Senior Third Rank) Hisangi (advisor at large) stayed in Yamaguchi which was the home ground of Yoshitaka OUCHI, Daimyo in the Sengoku period in the Suo Province, and got involved in the rebellion of Harukata SUE.
天文20年（1551年）正三位非参議であった良豊は父とともに周防国の戦国大名大内義隆の本拠である山口に滞在中に陶晴賢の謀叛に巻き込まれた。