RUNNYMEDE, ENGLAND - JUNE 15: (L-R) The Archbishop of Canterbury Justin Welby, Prime Minister David Cameron, Queen Elizabeth II and Prince Philip, Duke of Edinburgh are seated by the Magna Carta memorial ahead of a ceremony to celebrate the 800th anniversary of the Magna Carta on June 15, 2015 at Runnymede, England. The Prime Minister will join the Queen, senior members of the Royal Family and the Archbishop of Canterbury to mark the 800th anniversary of the sealing of the Magna Carta by King John. (Photo by Steve Parsons - WPA Pool / Getty Images)
