Franz Helm

Franz Helm (ca. 1500–1567) was an artillery master who lived and worked in what is now Germany in the first half of the 16th century. By his own account, he was born in Cologne, perhaps around 1500. Described as a "shooter, cannonier and fireworker," Helm fought with the armies of the Holy Roman Emperor Charles V against the Ottoman Empire. He subsequently moved to Landshut in the then Duchy of Bavaria, where he served the dukes William IV, Louis X and Albert V. He later served John II, Count Palatine of Simmern. Provided by Wikipedia