Question: What is the date of death of Li Hong's mother?
Sentence (from "Wu Zetian"): Wu Zetian (17 February 624 – 16 December 705), alternatively named Wu Zhao, Wu Hou (Empress Wu), during the later Tang dynasty as Tian Hou, in English as Empress Consort Wu, was a Chinese sovereign who ruled unofficially name of the emperor and as empress consort, power behind the throne, and later officially as regent, empress dowager, empress regnant  during the brief Zhou dynasty (690–705), which interrupted the Tang dynasty.
Relevant evidence: Yes