Oei Hui-lan (Chinese: 21 December 1889 – 1992), known as Madame Wellington Koo, was a Chinese-Indonesian international socialite and style icon, and, from late 1926 until 1927, the First Lady of the Republic of China.
She was married firstly to British consular agent Beauchamp Caulfield-Stoker, then to the pre-communist Chinese statesman Wellington Koo, and was a daughter and heiress of the colonial Indonesian tycoon Oei Tiong Ham, Majoor der Chinezen.
Both the parents of Oei Hui-lan hailed from the establishment: her father stemmed from one of the wealthiest families in Java, while her mother came from the 'Cabang Atas' aristocracy as a descendant of a Luitenant der Chinezen in Semarang's 18th-century Dutch bureaucracy.
After an unsuccessful marriage with Caulfield-Stoker, she met Wellington Koo while in Paris in 1920. They married in Brussels the following year and first lived in Geneva in connection with the establishment of the League of Nations.
In 1923, she moved with her husband to Beijing where he served as Acting Premier in the evolving republican Chinese state. During his second term (October 1926—June 1927), Wellington Koo also acted as President of the Republic of China for a brief period, making Oei Hui-lan the First Lady of China.
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The couple then spent time in Shanghai, Paris and London where Oei Hui-lan became a celebrated hostess. In 1941, she moved to New York where she died in 1992.
Oei Hui-lan, or Madame Koo as she became known, is also remembered for writing two autobiographies and for her contributions to fashion, especially her adaptations of traditional Chinese dress.
