Freytag, Gustav, b. Neuhaldensleben (near Magdeburg, Germany), Jan. 23, 1852, d. Steeg (in the municipality of Bad Goisern, Upper Austria), Dec. 19, 1938, cartographer. Came to Vienna in 1866 and started his own business in 1879. Together with W. Berndt founded the cartographic institute F. & Berndt in 1885 ( Freytag-Berndt und Artaria KG), which has become well-known for its tourist maps used for hiking and walking. Some of these maps were updated by F., who inspected the individual regions himself. Together with Heinrich Hess F. explored the Ennstaler Alpen, a mountain range belonging to the Austrian Alps. F. designed a colour scale for physical maps which is still being used today.