Matsudaira Sadanobu
In 1805, Kanshin-in died, and her influence was replaced by that of Chikamune's great-grandmother. In 1806, Chikamune was wed to Aya-hime's younger sister, Asa-hime, thus re-securing the connection between the Date clan and the Tokugawa, and in 1807, the retired "rōjū" Matsudaira Sadanobu spent four months in Sendai to oversee affairs. In 1808, the shogunate assigned Sendai Domain to secure the northern frontier of Japan at Hakodate, Iturup and Kunashir against increasing incursions by Russia. The domain dispatched 1700 troops to these areas.