京都所司代
In 1825, Tadakuni received the post of "Osaka jōdai" (Castellan of Osaka), with a promotion to Lower 4th Court Rank. The following year (1826), he became Kyoto Shoshidai, the shogunate’s official representative to the Court in Kyoto. His courtesy title was changed from "Izumi-no-kami" to "Echizen-no-kami". In 1828, Tadakuni became a "Rōju". He steadily rose through the ranks of the "Rōjū" to become Senior "Rōjū" in 1839.