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Which emperor became ruler at age nine under Fujiwara Yoshifusa’s regency?
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The emperor who ascended the throne at age nine under the regency of Fujiwara Yoshifusa was Emperor Seiwa.
In 858, Yoshifusa placed his nine-year-old grandson on the throne and assumed the role of regent (sesshō), marking the first time in Japan that a commoner served as regent for a child sovereign.1