He served four Tudor monarchs — Henry VII, Henry VIII, Edward VI, and Mary I — and somehow survived them all. Meet Sir John Gage: the cautious courtier who held the keys to the Tower of London. #TudorHistory #OnThisDay #SirJohnGage #HenryVIII #MaryI #TowerofLondon #Tudors #TrueHistory | The Anne Boleyn Files