お家騒動
Iwakitaira Domain was re-assigned to Naitō Masanaga. Masanaga transferred 20,000 "koku" domain to his eldest son, Naitō Tadaoki and another 10,000 "koku" to Hijikata Katsushige creating Izumi Domain and Kubota Domain, leaving Iwakitaira with 70,000 "koku". Under early Naitō rule, the domain implemented numerous fiscal reforms, developed large amounts of new rice lands, and constructed massive irrigation works. However, this prosperity did not last long, as later Naitō rulers were very young and often dissolute, preferring to leave government matters in the hands of subordinates, who often formed rival cliques, leading to "O-Ie Sōdō". A series of crop failures caused by implement weather led to a peasant revolt in 1738, at which point the Tokugawa shogunate stepped in, and transferred the Naitō to Nobeoka Domain in distant Kyushu.