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Trần Lệ Xuân, more popularly known in English as Madame Nhu, was the de facto First Lady of South Vietnam from 1955 to 1963. She was the wife of Ngô Đình Nhu, who was the brother and chief advisor to President Ngô Đình Diệm.
First Lady of South Vietnam from 1955 to 1963 · From Wikipedia