"Downton Abbey" centers on a British aristocrat, RobertCrawley, the Earl of Grantham, who has three daughters but no sons to whom he can leave his estate, as required under British property rules at the time.
"If I knew why the show was so successful, I'd be a billionaire, " said Hugh Bonneville, who stars as RobertCrawley, the Earl of Grantham, and enjoys watching "Curb Your Enthusiasm" "on loop" in his spare time.