Angelica Singleton Van Buren (February 13, 1818 – December 29, 1877) acted as the First Lady of the United States. She was the daughter-in-law of Martin Van Buren, the 8th president of the USA. Angelica Singleton had married the President's son, Abraham Van Buren. She took over the role of the First Lady, as the president's wife had died 17 years earlier.