William was the son of John St. John and Elizabeth Whettle. The date and place of his birth have not been found.
William St. John
John St. John (c1495-1576)
sir John St. John (1473-1512)
Oliver St. John (-<1497)
Elizabeth le Scrope (-1503)
Joan Iwardby
sir John Iwardby
Katherine Neville
Elizabeth Whettle