For 10 points, name this former Dowager who became the only female emperor of China.
This figure apocryphally banished the Peony from the White Horse Temple, whose abbot "found" the laughably fraudulent Great Cloud Sutra, which linked this figure with the Maitreya Buddha. While holding the cairen, or fifth-rank, this figure led the royal entourage in its first participation in the Mount Tai sacrifices, an act made possible by a successful counter-coup that embroiled Li Zhong and the father of Shangguan Wan'er, this ruler's facially-tattooed adviser. This ruler (*) abdicated after having a pair of rivals de-limbed and drowned in wine, and rose to power after convincing Gaozong that Lady Wang had murdered his child. This foe of the Zhang brothers ruled for 14 years during the Second Zhou, which interrupted the Tang dynasty. For 10 points, name this former Dowager who became the only female emperor of China.
This figure apocryphally banished the Peony from the White Horse Temple, whose abbot "found" the laughably fraudulent Great Cloud Sutra, which linked this figure with the Maitreya Buddha.
{Wu Zetian} [or {Wu Zhao}]