Tokugawa Ienari
Yonekura Masanori was born as the 9th son of Mizuno Kadakane, "daimyō" of Karatsu Domain in Hizen Province. In January 1803, he was adopted to be heir to the 5th "daimyō" of Mutsuura Domain (Yonekura Masayoshi), and was confirmed to that position in an audience with "Shōgun" Tokugawa Ienari in March of the same year. Yonekura Masayoshi then claimed illness, and retired on June 15, surrendering his title and official positions.