Empress Xiaozhenxian (1837-1881), Niu Hulu, was a native of Xianghuang Banner in Manchuria and the daughter of Mu Yang'a, the third-class benefactor of Youjiang Road in Guangxi. He is 6 years younger than Xianfeng. In the second year of Xianfeng (1852), she was drafted into the palace and given the title of concubine Zhen.