Emperor Gaozong of Tang

Emperor Gaozong of Tang (21 July 628 – 27 December 683) was the ninth son of Emperor Taizong of Tang and the third emperor of the Tang Dynasty. He was famous for marrying Wu Zetian, who later became the first and only female emperor in China.
Many historians viewed Gaozong as a weak ruler, because he was always controlled by his wife Wu Zetian.However, during his rule,Tang Dynasty gained lots of land and had the largest territory.