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It Happened One Night (1934) More at IMDb Pro »

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It Happened One Night is a romantic comedy based on a short story titled Night Bus, written by American writer and investigative journalist Samuel Hopkins Adams [1871-1958] and originally published in the August 1933 issue of Cosmopolitan magazine.

Neither. They're similar to some extent, but hardly identical. Hepburn's character isn't trying to get back to her husband; she just wants a break from her royal duties. In Roman Holiday, there's no animosity between the main characters, whereas it's a major, major part of It Happened One Night. They do both have reporters scheming to get an exclusive, but you could say the same thing about dozens of other movies.