He was born on April 28 , 1442 . He was King of England from March 4 , 1461 until his death on April 9 , 1483 . Edward IV ( 28 April 1442 â `` 9 April 1483 ) was King of England from 4 March 1461 until 3 October 1470 , and again from 11 April 1471 until his death .