Some farms were recorded at Zeltweg in the
Duchy of Styria already during the 13th century. The village then was called
Celtwich, its name is recorded in 1430 for the first time. During the 15th century, there were considerable difficulties resulting from famines, failed harvests, and epidemics, From 1569 onwards, the
Habsburg archduke
Charles II of Austria initiated the
rafting of timber down the Mur, which gained considerable importance for Zeltweg's history. During the following decades, Zeltweg grew and was a target of migration. During the 18th century, the population shrank considerably because of the expansion of roads. In 1848, Count
Hugo Henckel von Donnersmarck, who came from
Upper Silesia, decided to relocate his family's
smeltery from Carinthian
Frantschach-Sankt Gertraud to the site. This
Industrial Revolution brought a boom for Zeltweg. A railway station was built in 1868. Zeltweg was detached from neighboring Fohnsdorf as a municipality in its own right and the first mayor, Heinrich Dillinger, was elected in 1875. After the Austrian
Anschluss in 1938, the Zeltweg ironworks were incorporated into the
Reichswerke Hermann Göring conglomerate, employing numerous
unfree labourers during
World War II. At the end of the war, Zeltweg was first occupied by
Soviet and then
British troops. Still, there was an upswing both in education and in the industry after the war. Zeltweg received
town privileges on 1 January 1966. ==Main sights==