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|Empress Sunjeong-hyo in 1909.|
|Tenure||20 July 1907 – 29 August 1910|
|Pretend||29 August 1910 – 24 April 1926|
|Successor||Crown Princess Euimin|
|Spouse||Sunjong of Korea|
20 August 1894|
Hanyang (Seoul), Joseon Dynasty (now South Korea)
|Died||3 February 1966
Nakseon Hall, Changdeok Palace, Seoul
|Revised Romanization||Sunjeong Hyo Hwang-hu|
|McCune–Reischauer||Sunjŏng Hyo Hwang-hu|
Early life 
Empress Sunjeong was born Lady Yun of Haepyeong in Seoul and her father was Marquis Yun Taek-yeong, the Lord of Haepung. Yun Bo-seon, 2nd president of the Republic of Korea, was her ninth cousin three times removed. She married Crown Prince Cheok after his first wife (known posthumously as Empress Sunmyeong) died. On 20 July 1907, she became Empress of Korea when her husband ascended the throne after the forced abdication of his father, Emperor Gwangmu. The Empress was demoted by the Japanese government by the Japan-Korea Annexation Treaty of 1910 and thereafter known as Her Majesty Queen Yi of Korea (this title, however, was ignored in Korea).
Empress Sunjeong became a widow 24 April 1926, when Emperor Yunghui died without issue at the Changdeok Palace in Seoul. Emperor Yunghui had been rendered infertile (and was also said to be mentally disabled) by poisoning in the Coffee Poisoning Plot.
Korean War 
During the Korean War, Empress Sunjeong stayed in Changdeok Palace as long as she could in the face of advancing forces from North Korea. During the war, the soldiers of North Korea invaded the palace but she reproved them and drove them all out. She then escaped secretly to the Unhyeon Palace when the war situation became too serious. As the war progressed she moved to Busan with other Imperial family members, including Princess Hui (wife of Prince Wanheung). According to "The World is One", Princess Yi Pangja's autobiography, Empress Sunjeong went to Busan on foot.
After the Korean War 
After the war, the new government of President Rhee Syng-man, jealous of the popularity of the Imperial House, prevented Empress Sunjeong from entering the Changdeok Palace. She was kept imprisoned in Suin Hall, a narrow and unsuitable cottage in Jeongneung, Seoul. After a change in government in 1961 she returned to Nakseon Hall, Changdeok Palace with her dutiful ladies-in-waiting Park Chang-bok (d.1981), Kim Myung-gil (d.1983) and Sung Ok-yeom (d.2001), and five other staff.
Empress Sunjeong became a Buddhist in her later years. She died childless on 3 February 1966, aged 72, at Nakseon Hall, Changdeok Palace, Seoul from a heart attack. She was given a state funeral and a private Buddhist funeral. She is buried beside her husband, Emperor Yunghui at the Yureung.
She is known posthumously as Empress Sunjeong of Korea (officially, (純貞孝皇后; 순정효황후; Sunjeonghyo Hwanghu; Empress Sunjeong-hyo).
Titles from birth 
- Lady Yun of Haepyung (1894–1906)
- Her Imperial Highness The Crown Princess Cheok of Korea(1906–1907)
- Her Imperial Majesty The Empress of Korea (1907–1926)
- Her Imperial Majesty The Empress Dowager of Korea (1926–1966)
- Her Late Imperial Majesty Empress Sunjeong of Korea (Posthumous Title)
See also 
- Empress Sunjeong's great-great-great-great-great-great-great-great-great-great-grandfather Yun Bang (1563-1640) was the older brother of Yun Bo-seon's great-great-great-great-great-great-great-grandfather, Yun Heun (?-?).
|Empress consort of Korea
20 July 1907 – 29 August 1910
|Titles in pretence|
|Loss of title
||— TITULAR —
Empress consort of Korea
29 August 1910 – 24 April 1926