Colin Firth knew ''nothing'' about the British monarchy before he agreed to star as King George VI in 'The King's Speech'.
The 50-year-old actor - who is believed to be a frontrunner for an Oscar nomination for his portrayal of stuttering British King George VI in the Tom Hooper-directed drama - knew "nothing" about the royal family prior to his signing up to the film.
He said: "I knew nothing about it. I knew that he existed.
"I knew about the abdication crisis that led him to becoming king, but I wasn't even quite sure whether he was George V or George VI.
"I remember my mother telling me that she had great sympathy for him because of the stammer."
The British star didn't even know he was married to Elizabeth Bowes-Lyon - best known as the Queen Mother and played by Helena Bonham Carter in the movie.
He told The Sun newspaper: "I knew he died relatively young and that the Queen came to the throne very young.
"We all knew that because that was 1952 and she's still here. I couldn't have told you the date that it all happened. I don't think that I even knew that our Queen Mother was his wife.
"I should have - I mean it made sense - but I'm not a royal watcher."
'The King's Speech' is released worldwide throughout January and February.