The Other One said: "Tennessee Williams wrote the role of Serafina in The Rose Tattoo for Anna Magnani, but she turned it down because she didn't think she could handle the English language on stage. Maureen Stapleton did the role on stage and won a Tony (as best featured actress, which makes no sense) and Ms. Magnani, less intimidated by the camera, did the film and won an Oscar (as Best Actress, which does)."
At that point in time the categories were determined solely by billing, the option to petition for a change in category was not established for a good many years after that original production of The Rose Tattoo. (William Daniels declined his nomination for 1776, since he felt that he was indeed the lead of the show but his billing below the title placed him in the featured category, so it was sometime in the 70s that the petition for category reassignment was established).