 Soon after, Matsudaira Sadaaki became "daimyō" of Kuwana, and Tatsumi became his page, with a 180 "koku" stipend.Together with Matsudaira Sadaaki, he left for Edo in 1861, where was permitted to attend the elite Shogunate school at Shoheiko, and where he was hailed as a prodigy.When Matsudaira Sadaaki was appointed as "Kyoto Shoshidai," Tatsumi followed him to Kyoto, where he served as a liaison with other domains.