Shogun were military rulers, not just any leaders, with strong samurai connections. The shogun commanded armies like a general.
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Not Emperor
Shogun were distinct from emperors; they held real power, while emperors were symbolic. Despite being an emperor, he had less influence than the shogun.
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Cultural Importance
Knowledge of shoguns is crucial to understanding Japanese history and literary references. Many historical novels feature a shogun as a central figure.