Sarah Bradford is a historian and biographer. Her books include Cesare Borgia (1976), Disraeli (1982), winner of the New York Times Book of the Year, Princess Grace (1984), Sacherevell Sitwell (1993), Elizabeth: A Biography of Her Majesty the Queen (1996), Lucrezia Borgia (2005), Diana (2007) and Queen Elizabeth II: Her Life in Our Times (2011). She frequently appears on television as an authority on her biographical subjects and as a commentator on notable royal events. She is currently working on a full scale biography of Queen Victoria. She lives in London.