'Game of Thrones' showrunner David Benioff was surprised to learn that Britain's Queen Elizabeth "is not allowed to sit on a foreign throne".
The 44-year-old screenwriter and television producer welcomed the royal to the set of the hit TV show in June last year, when she was invited and declined the chance to sit on the Iron Throne.
Asked why she refused to sit, he told 'Late Night with Seth Meyers': "She's not allowed to.
"Apparently, the Queen of England is not allowed to sit on a foreign throne, so this is an esoteric rule we didn't know about until that moment. It looks like we're saying, 'Don't touch, Queen.'"
Earlier this month, meanwhile, it was reported that the Queen could be removed as the Head of State of Barbados.
Freundel Stuart - the country's prime minister - shared a plan that would see the Queen replaced by a ceremonial President in time for the 50th anniversary of independence next year.
George Pilgrim, the general secretary of the Democratic Labour Party, revealed the idea will be put to parliament, but he doesn't anticipate there being any serious opposition.
He said: "This will move the country through to the next major step in the process of nationhood."