The Lady from Longacre (1921)

To escape a loathsome marriage to the king of a neighboring principality, Princess Isabel flees her kingdom for England, where she is rescued by Lord Anthony Conway. His friends are distressed by his gay escapades, and they rebel when he encourages them to entertain the princess, assuming her to be an actress whom she strongly resembles. Returning to her country with the Englishman, she realizes that she must marry the neighboring king to save her country.