下野国
In 1635, Sukemune was rewarded with properties in Shimotsuke Province with an assessed value of 10,000 "koku", which (when added to his existing 5,600 "koku") enabled him to become daimyō of the newly created Yamakawa Domain. His courtesy title was changed at that time to "Bitchu-no-kami". In 1638, Yamakawa Domain was suppressed when Sukemune was transferred to Nishio Domain in Mikawa Province with an increase in revenues to 35,000 "koku". From 1641–1643, he was appointed a "bugyō" overseeing the work of noted Confucian scholar Hayashi Razan.