Dr. Gregorius Carbonarius worked as magister sanitatis in Radgona (Radkersburg), successfully battling the plague until 1687 when he went to Russia where he became personal doctor to Czar Peter the Great in 1688. He accompanied the Czar on his journeys West and took part in many battles. In 1700 the Swedes captured him at Narva and imprisoned him until 1704. Dr. Carbonarius was sending secret messages to the Russian government on the movements and man-power of the Swedish army until he was set free in 1704 upon the intervention of Emperor Leopold I. Czar Peter the Great appointed him Government Secret Councillor, and he was made knight by the Austrian Emperor. At the end of 1715 Carbonarius left Moscow, took ill on the journey, and died in his home at Naklo (Slovenia) in 1717.