Tamsweg is located on the southern slope of the Schladminger Tauern mountain range within the Central Eastern Alps, in the valley of the upper Mur River, the driest basin in Austria. The municipality consists of the cadastral communities of Haiden, Keusching, Lasaberg, Mörtelsdorf, Sauerfeld, Seetal, Tamsweg and Wölting.
History
Once part of the Roman Noricum province, the Lungau from the 6th century onwards was a Slavic settlement area, which in the 8th century fell under the influence of the Bavarian dukes. The locality of Taemswich was first mentioned about 1156.
The parish church, originally a filial of nearby Mariapfarr, was acquired by Archbishop Eberhard II of Salzburg in 1246. The Prince-Archbishops had the Saint Leonard pilgrimage church erected about 1433, which in the late 15th century was enlarged as a fortified church in view of repeated Ottoman invasions.
In 1490, it was occupied by Hungarian troops of King Matthias Corvinus and became the site of violent fights against the armed forces of Emperor Frederick III.
The archbishops fought against the Protestant Reformation in their estates, in the course of the Counter-Reformation, Tamsweg was enlarged as an episcopal residence and its citizens vested with further market rights in 1587, especially concerning the trade with salt and iron.