Johann Conrad Dippel
Johann Conrad Dippel (1673-1734) published many theological works under the name Christianus Democritus, most of them are still preserved. He invented the color "Preussisch Blau" (also "Berliner Blau"), and sold a self-mixed life elixier. He led a very adventurous life, and often got into trouble because of his disputed opinions (and because of money).
His connection to the Castle Frankenstein (near Darmstadt/ Germany), and the idea that he was ideal to Mary Shelley's novel Frankenstein is controversial.