Anna Eleanor Roosevelt (; October 11, 1884 – November 7, 1962) was an American political figure, diplomat and activist. She served as the First Lady of the United States from March 4, 1933, to April 12, 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 Allenswood Boarding Academy in London and was deeply influenced by its headmistress Marie Souvestre. Returning to the U.S., she married her fifth cousin once removed, Franklin Delano Roosevelt, in 1905. The Roosevelts' marriage was complicated from the beginning by Franklin's controlling mother, Sara, and after Eleanor discovered her husband's affair with Lucy Mercer in 1918, she resolved to seek fulfillment in leading a public life of her own. She persuaded Franklin to stay in politics after he was stricken with a paralytic illness in 1921, which cost him the normal use of his legs, and began giving speeches and appearing at campaign events in his place. Following Franklin's election as Governor of New York in 1928, and throughout the remainder of Franklin's public career in government, Roosevelt regularly made public appearances on his behalf; and as First Lady, while her husband served as president, she significantly reshaped and redefined the role of First Lady.