George was executed 17 May 1536. It was the exact same day that Henry VIII and Anne Boleyn had their marriage annulled.
Alternate birth place; Hever Castle, Kent, England
Camden Society Series (London, 1846) Vol. 35: "The Chronicle of Calais, in the Reigns of Henry VII and Henry VIII to the Year 1540" Page 46: 1536: "The words of ser Gorge Boleyne, brothar to qwene Anne, warden of the v. portes, on the xvij. of May, when he toke his deate at the Towre Hill at London, ..."
"Royal Ancestry" 2013 by Douglas Richardson Vol. II. p. 57