Ellen Arthur: BritannicaEllen Arthur, née Ellen Lewis Herndon, byname Nell, (born August 30, 1837, Culpeper, Virginia, U.S.—died January 12, 1880, New York, New York), wife of Chester A. Arthur, 21st president of the United States. She never served as first lady because she died of pneumonia before her husband assumed office. The president’s sister, Mary Arthur McElroy, acted as White House hostess.