
Shogunate naval officer who negotiated Edo's surrender.
Katsu was sent by the shogunate to study Western naval science and shipbuilding in the Netherlands. He returned with knowledge that he applied to modernize Japan's navy, including the construction of modern warships.
Katsu was appointed commander of the Tokugawa shogunate's navy. He modernized the fleet and trained officers, including future leaders of the Imperial Japanese Navy, but was unable to prevent the shogunate's eventual defeat.
Katsu Kaishu, as the shogunate's representative, met with Saigo Takamori of the imperial forces to negotiate the peaceful surrender of Edo Castle. This prevented a destructive battle in the capital and facilitated the transition to imperial rule.
After the Restoration, Katsu served as Minister of the Navy in the new Meiji government. He oversaw the consolidation of the imperial navy and the adoption of Western naval practices, but resigned in 1873 due to political disagreements.