Before the age of feudalism, what was the leader of japan called?

Japan's Tokugawa or( Edo) period, which was lasted from  1603 to 1867, would be the final era of traditional Japanese government, culture and society before the Meiji.
When Tokugawa shogunate growing increasingly weak by the mid-19th century,two powerful clans joined forces in early 1868 to seize power as part of an "imperial restoration"name for Emperor Meiji.

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