According to your description, this plot may come from the movie Cleopatra. The film was directed by British director joseph L Mankiewicz and released on 1963. The film tells the story of love and power between Cleopatra and Rome, Julius Caesar and Anthony. Among them, Cleopatra gets off the sedan chair in the early stage of the film, and the unlucky slave appears in the later stage of the film.
Please note that the above information is for reference only, and the specific plot and details may be different for different versions of the film. If you are interested in this story, I suggest watching the full version of the movie to get more accurate information.