Happy April Fools' Day! This year, at HuffPost Books we're celebrating April Fools' by looking back at some of the greatest literary hoaxes of all time. From a faked document by Roman Emperor Constantine to the woman who posed as a young transvestite prostitute in a series of "memoirs," the tradition of less-than-truthful writing is as old as writing itself. The authors below go beyond James Frey changing some details of his life story; these people invented entirely new personas and documents that left the whole world fooled.
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