Sakamoto Ryoma was one of the key figures behind Japan's shift toward imperial restoration and the Meiji Restoration. He's best known for orchestrating the alliance between Satsuma and Choshu—two powerful domains that had been rivals—and for founding the Kameyama Shochu, a merchant and military organization that later became known as the Kaientai. His work brokering that crucial alliance and building institutions to support the restoration movement made him a pivotal player in one of Japan's most transformative periods.
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