Encyclopaedia Britannica academic edition (online), viewed 6 Mar. 2013 (Edward IV, also called (until 1459) Earl of March, b. Apr. 28, 1442, Rouen, Fr.; d. Apr. 9, 1483, Westminster, Eng.; king of England, June 1461-Oct. 1470, and again from Apr. 1471 until his death)