I'm afraid 'known fact' is a bit strong.
The story, as we know it, derives from a 'penny dreadful' of 1846. These were sensational melodramas, some complete fiction, some based on fact, but most with only a grain of truth.
It is certainly not clear, or generally accepted, that the story derives from anything more than some newspaper account of a barber executed for murder, perhaps mixed with other stories floating around in the 19th century ether. Peter Haining claims to have found evidence for a rather more substantial foundation, placing him around 1800 but, to quote another not entirely reliable source (in this case accurate), 'his claims have not been widely accepted, and other investigators have been unable to locate some of the sources he cites.' (Wikipedia)
It's also worth bearing in mind that many readers of the penny dreadfuls simply believed what they read and spread them about as fact, a tendency likely to lead to them being recounted as fact in contemporary writings. As Sweeney Todd's story seems to have gained a particularly good grip on contemporary imaginations, it's unfortunately likely that this renders a certain amount of evidence unreliable.
There is one other point that makes it suspicious: his original appearance in print was as a _secondary_ character in a story called 'The String of Pearls: A Romance'. Both the fact that he was secondary and the title of the story imply he was fictional.
So there's a good chance that there was a murdering barber in London around the turn of the nineteenth century, but each extra sensational detail becomes less and less likely after that: that he was not just a killer, but a serial killer; that the meat was made into pies; and so on. These stories tend to have a life of their own.
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