Legend tells of Sweeney Todd, a barber in Fleet Street, London, who would rob and kill (not necessarily in that order) solitary customers, disposing of their bodies via a meat-pie shop next door. The story is celebrated in a popular Victorian melodrama, in a 1936 film, in a musical by Stephen Sondheim (1979), and in rhyming slang (“Sweeney Todd” = “Flying Squad”, an elite unit of the Metropolitan Police).
The story was the most successful of a spate of such shockers dating from the early 19th century. Sawney Bean, the Man-Eater of Midlothian was supposedly based on a real 13th-century Scottish legal case; also published about this time were two French versions, both set in Paris. All of these were claimed to be based on true stories — but then, this pretence was standard practice for novelists at the time. The “original” version of Sweeney Todd was written by Edward Lloyd under the title of The String of Pearls, published around 1840.