The Five Avenues in Tianjin hides many famous residences and former sites, Qingwang Mansion is one of them. It was originally the residence of the famous eunuch Xiao De Zhang in the late Qing Dynasty, and was later purchased by Prince Qing Zai Zhen to become his later life residence. Zai Zhen is the 12th and last iron hat king of the Qing Dynasty. It has played a great role in promoting the development of Tianjin's economy and culture.