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Robert Mitchum's BAFTA nomination came in 1971, recognizing his exceptional performance in the film "Ryan's Daughter." He received the nomination in the category of "Best Actor in a Leading Role" for his portrayal of Charles Shaughnessy, a complex character caught in a tumultuous love affair during the Irish Civil War. Mitchum's nuanced acting brought depth and authenticity to the role, making his nomination well-deserved.