Berthold Schwarz, German Franciscan monk, c 1380.
© Science Museum / Science & Society Picture Library
Etching. Plate taken from 'Monuenta Pulveris Pyrll' (c 1380). depicting the semi- legendary German Franciscan monk of Freiburg, who real name was Konstantin Anklitzen, nicknamed Schwarz ('black') due to his chemical experiments. Around 1320 he is said to have brought gunpowder (or guns) into practical use.