Joachim Vadianus (born Joachim von Watte)

A Swiss humanist, and city physician and mayor of St Gallen. Vadianus oversaw the town's conversion to Protestantism during the Reformation. He wrote on a wide range of subjects, including history, literature and theology, and produced a world atlas, the 'Epitome Trium Terrae Partium'. This was his best-known work, although in the field of geography he also wrote a commentary for Pomponius Mela's 'De Situ Orbis'.