Empress Dowager Cixi (Mandarin pronunciation: [tsʰɹ̩̌.ɕì]; 29 November 1835 – 15 November 1908) was a Manchu noblewoman of the Yehe Nara clan who had de facto control of the Chinese government in the late Qing dynasty as empress dowager and regent for almost 50 years, from 1861 until her death in 1908. Selected as a concubine of the Xianfeng Emperor in her adolescence, she gave birth to a son, Zaichun, in 1856. After the Xianfeng Emperor's death in 1861, his five-year-old son became the Tongzhi Emperor, and Cixi assumed the role of co-empress dowager alongside Xianfeng's widow, Empress Dowager Ci'an. Cixi ousted a group of regents appointed by the late emperor and assumed the regency along with Ci'an. Cixi then consolidated control over the dynasty when she installed her nephew as the Guangxu Emperor at the death of the Tongzhi Emperor in 1875. Ci'an continued as co-regent until her death in 1881.

Cixi supervised the Tongzhi Restoration, a series of moderate reforms that helped the regime survive until 1911. Although Cixi refused to adopt Western models of government, she supported technological and military reforms and the Self-Strengthening Movement. She supported the principles of the Hundred Days' Reforms of 1898, but feared that sudden implementation, without bureaucratic support, would be disruptive and permit the Japanese and other foreign powers to take advantage of China. She placed the Guangxu Emperor under virtual house arrest for supporting radical reformers, publicly executing the main reformers. After the Boxer Rebellion led to invasion by Allied armies, Cixi initially backed the Boxer groups and declared war on the invaders. The ensuing defeat was a stunning humiliation, ending with the occupation of Beijing and the Qing regime on the brink of collapse. When Cixi returned from Xi'an, she backtracked and began to implement fiscal and institutional reforms aimed to turn China towards a constitutional monarchy. Upon Guangxu's death in November 1908, Cixi installed the two-year-old Puyi on the throne, but she herself died shortly after. Her death left the court in the hands of conservatives governing a restless, deeply divided society.

Historians both in China and abroad have debated Cixi's legacy. Traditionally, she has been viewed as a ruthless despot whose reactionary policies – although successful in managing to prolong the ailing Qing dynasty – led to its humiliation and eventual downfall in the 1911 revolution. More recently, some have advanced the revisionist interpretation that reformers and revolutionaries scapegoated her for deep-rooted problems which were beyond salvaging, and laud her penchant for moderate reform, including the founding of Peking University and Beiyang Army, and maintenance of political order in an era of destabilising European colonialism.

Xingzhen of the Yehe Nara clan was born on the tenth day of the tenth lunar month in the 15th year of the Daoguang Emperor's reign (29 November 1835). Her father was Huizheng (惠征), a member of the Bordered Blue Banner who held the title of a third class duke (三等公). Palace archives show that Huizheng was working in Beijing during the year of Xingzhen's birth, an indication that she was born in Beijing. The file records the location of her childhood home: Pichai Hutong, Xisipailou, Beijing (西四牌樓劈柴胡同). Lady Yehe Nara had a sister named Wanzhen and a brother named Guixiang.

In 1851, Lady Yehe Nara participated in the selection of wives for the Xianfeng Emperor alongside 60 other candidates. Lady Yehe Nara was one of the few candidates chosen to stay. Among the other chosen candidates were Noble Lady Li of the Tatara clan (who became Consort Li, eventually Imperial Noble Consort Zhuangjing) and Concubine Zhen of the Niohuru clan (who became empress consort, eventually Empress Dowager Ci'an). On 26 June 1852, Lady Yehe Nara left her widowed mother's residence at Xilahutong and entered the Forbidden City and was placed in the sixth rank of consorts, styled "Noble Lady Lan".

On 28 February 1854, Noble Lady Lan was elevated to the fifth rank of consorts and granted the title "Concubine Yi". In 1855, she became pregnant, and on 27 April 1856, she gave birth to Zaichun, Xianfeng's first and only surviving son. On the same day, she was elevated to the fourth rank of consorts as "Consort Yi". In 1857, when her son reached his first birthday, Consort Yi was elevated to the third rank of imperial consort as "Noble Consort Yi". This rank placed her second only to Empress Niohuru among the women within Xianfeng's harem.

Unlike many of the other Manchu women in the imperial household, Noble Consort Yi was known for her ability to read and write Chinese. This skill granted her numerous opportunities to help the ailing emperor in the governing of the Chinese state on a daily basis. On various occasions, the Xianfeng Emperor had her read palace memorials for him and leave instructions on the memorials according to his will. As a result, she became well-informed about state affairs and the art of governing.

In September 1860, during the closing stages of the Second Opium War, the British diplomatic envoy Harry Parkes was arrested along with other hostages, who were tortured and executed. In retaliation, British and French troops under the command of Lord Elgin attacked Beijing, and by the following month they had burned the Old Summer Palace to the ground. Xianfeng and his entourage, including Noble Consort Yi, fled Beijing to Rehe Province (around present-day Chengde, Hebei). On hearing the news of the destruction of the Old Summer Palace, Xianfeng, who was already showing signs of dementia, fell into a depression. He turned heavily to alcohol and other drugs and became seriously ill. He summoned eight of his most prestigious ministers, headed by Sushun, Zaiyuan and Duanhua, and named them the "Eight Regent Ministers" to direct and support the future emperor. Xianfeng died on 22 August 1861 at the Chengde Mountain Resort in Rehe Province.