Anna Eleanor Roosevelt was an American political figure, diplomat and activist. She served as the First Lady of the United States from March 1933 to April 1945 during her husband President Franklin D. Roosevelt's four terms in office, making her the longest serving First Lady of the United States. Roosevelt served as United States Delegate to the United Nations General Assembly from 1945 to 1952. President Harry S. Truman later called her the First Lady of the World in tribute to her human rights achievements.Roosevelt was a member of the prominent American Roosevelt and Livingston families and a niece of President Theodore Roosevelt. She had an unhappy childhood, having suffered the deaths of both parents and one of her brothers at a young age. At 15, she attended Allenwood Academy in London and was deeply influenced by its headmistress Marie Souvestre.