For 10 points, name this empress who interrupted the rule of the Tang dynasty.
The giant Mingtang ceremonial hall built during this ruler's reign was burned down by a jealous lover. The monk Huaiyi authored a Buddhist commentary claiming this ruler was an incarnation of Maitreya. This ruler's preferred method of torture, in which the victim was dismembered and forced to sit in their own excrement, was known as the "human pig." This ruler constructed the Cave of Ten Thousand Buddhas in the (*) Longmen Grottoes, where a massive statue of this ruler can be found. The Zhang brothers were favorites of this ruler, who seized full power after the death of Gaozong and established the Zhou dynasty while ruling on behalf of her son Ruizong. For 10 points, name this empress who interrupted the rule of the Tang dynasty.
The giant Mingtang ceremonial hall built during this ruler's reign was burned down by a jealous lover.
Empress Dowager Wu Zetian [or Empress Wu; or Wu Zhao; or Empress Wu of the Zhou dynasty; only Wu is needed after "Empress" is read]