Johann Tserclas von Tilly - Johann Tserclaes, Count of Tilly (Johan 't Serclaes) (February 1559 - April 30, 1632), known as the Monk in Armor, was a General (Field Marshal) who commanded the Imperial and Holy Roman Empire's forces in the Thirty Years' War. He had a string of important victories and was one of two chief commanders of the Holy Roman Empire forces. 固opFoto *** Local Caption *** ces.