Munenari succeeded to headship in 1844. The
tairō Ii Naosuke ordered Munenari's retirement in 1858. He was placed under house arrest. He returned to prominence in the subsequent years of political maneuvering in
Kyoto, as a member of the conciliatory
kōbu-gattai (公武合体
union of court and bakufu) party. Late in Bunkyū 3 (1863), as a proponent of kōbu-gattai, he was made a member of the imperial advisory council (
sanyō-kaigi 参与会議), together with
Matsudaira Katamori and other like-minded lords. ==National leader==