Ansei Purge
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Ansei Purge (安政の大獄) was a purge, in 1858 and '59, of over 100 people from the bakufu, various han, and the Imperial court. Eight of those `purged' were also executed. It was carried out by Ii Naosuke in an effort to quiet opposition to his handling of the question of shogunal succession and the signing of the U.S.-Japan Treaty of Amity and Commerce.