By all accounts, Jack the Ripper is the most well-known serial killer pre-1900. At the time, the concept of a “serial killer” hadn’t even entered the collective consciousness.
However, as of now, no one can confirm with any certainty who the real Jack the Ripper was. One of the most intriguing suspects, though, is a man named Walter Sickert.
Also, during this period of his career, the subjects of many of Walter Sickert’s paintings were prostitutes, who many people believed Sickert was a client of.