Besme, also called Behmef, real name apparently Charles Dianovitz (Karel z Janovic), was a Bohemian in the pay of the Duke of Guise, who is recorded as the assassin of Protestant leader Gaspard de Coligny in 1572, using either a dagger or a "big sword". The assassin group called itself Picards de Bohème.
Later subsequently was made prisoner while warring against the Protestants of Saintonge, who put him to death.[1]
He is mentioned once in "The Three Musketeers".