Petrus Teufel was the dread leader of the Black Mist Raiders, and a Spark strong enough to give even Baron Wulfenbach trouble. Before his defeat, he caused vast destruction in Europa; only the Other has caused more death and chaos.
When investigating Gil's background, Tarvek Sturmvoraus information that led him to believe that his onetime friend from Castle Wulfenbach was none other than Teufel's son. However, as Tarvek himself concludes, this story was almost certainly planted by the Baron to provide a plausible cover against even such thorough research.
A footnote also reveals that the Baron's eventual defeat of Teufel involved the construction of an entire fake town which served as some form of bait, and that the resulting contaminated ruins are still uninhabitable.
Possibly relevant outside information Edit
"Teufel" is the German word for "devil" and "(heiliger) Petrus" is the German name for "Saint Peter".