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In page Wu Shun:

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Wu Shun (武顺), courtesy name Mouze (某则),[1] (623-665) was the Lady of Han during the Tang dynasty and the older[2] sister of Wu Zetian. The Lady of Han was an honorable title for relatives of the Emperor and Empress. Wu Shun was allegedly the mother of Li Xian,[3] the crown prince, and the rumors eventually led to his demise. In all likelihood, her sister Empress Wu, who had become a full-fledged power behind the throne after January 665, ordered her poisoning.[citation needed]