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In page Wu Zetian:

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By early 650, Consort Wu was a concubine of Emperor Gaozong, and she had the title Zhaoyi, the highest ranking concubine of the nine concubines in the second rank. Wu progressively gained immeasurable influence over the governance of the empire throughout Emperor Gaozong's reign. Over time, she came to control most major decisions made. She was regarded as ruthless in her endeavors to grab power, and was believed by traditional historians to have killed her own children. This was later proven false, as these rumors seem to have surfaced 400 years after her death.[note 1] This was likely due to the belief in ancient China that a woman was not suited to hold the power of the emperor.[citation needed]