There is one man outside the royal family who is allowed to call Queen Elizabeth by her first name and his identity has finally been revealed to royal fans.
Royal author Robert Hardman revealed the extent of closeness Queen Elizabeth shares with the person and his name is Nelson Mandela.
Mr Hardman was quoted telling Express UK, "One of her great friendships is with Nelson Mandela, they absolutely hit it off from the start and that was a friendship which lasted his entire time in office and well beyond.”
"He was the only world head of state who could get away with calling her Elizabeth."
"On one occasion he greeted her, not long after he ceased being president and he arrived and said, 'Elizabeth, you've lost weight'."
"No one else ever said that but she thought that was wonderful. He could simply get away with whatever he wanted."