Xianfeng Emperor in the context of "Empress Dowager Cixi"

The Treaty of Tientsin, also known as the Treaty of Tianjin, is a collective name for several unequal treaties signed at Tianjin (then romanized as Tientsin) in June 1858. The Qing dynasty, Russian Empire, Second French Empire, United Kingdom, and the United States were the parties involved. These treaties, counted by the Chinese among the unequal treaties, opened more Chinese ports to foreign trade, permitted foreign legations in the Chinese capital Beijing, allowed Christian missionary activity, and effectively legalized the import of opium. They ended the first phase of the Second Opium War, which had begun in 1856 and were ratified by the Emperor of China in the Convention of Peking in 1860, after the end of the war.

The Tongzhi Emperor (27 April 1856 – 12 January 1875), also known by his temple name Emperor Muzong of Qing, personal name Zaichun, was the ninth emperor of the Qing dynasty, and the eighth Qing emperor to rule over China proper. His reign, which effectively lasted through his adolescence, was largely overshadowed by the rule of Empress Dowager Cixi. Although he had little influence over state affairs, the events of his reign gave rise to what historians call the "Tongzhi Restoration", an unsuccessful modernization program.

The only surviving son of the Xianfeng Emperor, he ascended the throne at the age of five under a regency headed by his biological mother Empress Dowager Cixi and his legal mother Empress Dowager Ci'an. The Self-Strengthening Movement, in which Qing officials pursued radical institutional reforms following the disasters of the Opium Wars and the Taiping Rebellion, began during his reign. The Tongzhi Emperor assumed personal rule over the Qing government in 1873, but he had no interest in affairs of state and immediately came into conflict with his ministers. He was outmaneuvered by the dowager empresses.

Empress Xiaozhenxian (12 August 1837 – 8 April 1881), of the Manchu Bordered Yellow Banner Niohuru clan, was a posthumous name bestowed to the wife and empress consort of Yizhu, the Xianfeng Emperor. She was empress consort of Qing from 1852 until her husband's death in 1861, after which she was honored as Empress Dowager Ci'an.

As empress dowager and one of the most senior members of the imperial family, she and Empress Dowager Cixi became co-regents during the reign of two young emperors: Zaichun, the Tongzhi Emperor and later Zaitian, the Guangxu Emperor. Although in principle, she had precedence over Cixi, Ci'an was in fact a self-effacing person and seldom intervened in politics, but she was the decision-maker in most family affairs. Instead, Empress Dowager Cixi was the decision-maker in most state affairs.

The Eastern Qing tombs (Chinese: 清東陵; pinyin: Qīng Dōng líng; Manchu: ᡩᡝᡵᡤᡳ
ᡝᡵᡤᡳ
ᠮᡠᠩᡤᠠᠨ, Möllendorff: dergi ergi munggan) are an imperial mausoleum complex of the Qing dynasty located in Zunhua county of Tangshan in Hebei province, 125 kilometres (78 mi) northeast of Beijing. They are the largest, most complete, and best preserved extant mausoleum complex in China. Altogether, five emperors (Shunzhi, Kangxi, Qianlong, Xianfeng, and Tongzhi), 15 empresses, 136 imperial concubines, three princes, and two princesses of the Qing dynasty are buried here. Surrounded by Changrui Mountain, Jinxing Mountain, Huanghua Mountain, and Yingfei Daoyang Mountain, the tomb complex stretches over a total area of 80 square kilometres (31 sq mi).