Science Fair Project Encyclopedia
To ensure the power of the shogunate, Iemitsu eliminated a number of daimyos and established the central administration, lasting for the next 200 years until the Meiji Era. He established the alternating residency and hostage system (Sankin Kotai) in 1635, set the isolation policy, or Sakoku eventually closing off Japan from the rest of the world between 1633 and 1639, and saw the final eradication of Christians on the Japanese islands. He also completed anti-Christian policies; he executed or expelled all of remaining Christian missionaries and required the entire Japanese to register them to Buddist temples. When rebellion against this policy arose in Shimabara, he suppressed it harshly. The main domestic and foreign policies of the Tokugawa shogunate were completed by him.
Iemitsu's younger brother Tadanaga was a possible rival for the office of shogun until his death in 1633.
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