Assertion: reigning empress | /r/HasProperty | the empress wu
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Source sentences:
text: It was generally not accepted for a female to succeed to the throne as a sovereign regnant in her own right, rather than playing the role of a sovereign's consort or regent for a sovereign who was still a minor in age, so that in history of China there has only been one reigning empress, the Empress Wu, whose reign occurred during (and actually caused) an interregnum of the Tang dynasty.