Maurice Benyowsky was a notorious adventurer who wrote a well-known, highly fictionalized autobiography (Memoirs and Travels of Mauritius Augustus Count de Benyowsky). His supposed exploits became famous enough to be the basis of plays and operas.
This is a source request: has any modern scholar sought to sort the fact from the fiction? I did find a breezy 1989 biographical sketch in French, Héros ou imposteur? Un aventurier au XVIIIe siècle by Miklós Molnár, but there seems to be much more to the story. The best work on him might have been done in the Hungarian or Polish languages; several relevant books were written in the late 1800s. The multiple spellings of his surname make searching for him a bit of a challenge.