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In page Wu Zetian:

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In the early period of the Tang dynasty, because all the emperors were her direct descendants, Wu was evaluated favorably. But commentary in subsequent periods, especially the book Zizhi Tongjian compiled by Sima Guang, harshly criticized her. By the period of Southern Song dynasty, when Neo-Confucianism was firmly established as China's mainstream political ideology, it determined the evaluation of Wu.[citation needed]