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In page Wu Zetian:

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In 675, as Emperor Gaozong's illness worsened, he considered having Empress Wu formally rule as regent. The chancellor Hao Chujun and the official Li Yiyan both opposed this, and he did not formally make her regent, and did not formally bestow her with such authorities. But Empress Wu was more powerful than Emperor Gaozong and he was afraid of Wu because of her high intelligence and skills in manipulating officials; thus, until the end of his reign, she had decision-making power on most events in the governmental and border matters, and could appoint civil ministers and military generals.[citation needed]