Thesen is a place, that before the Treaty of Saint-Germain belonged to Austro-Hungary and was situated in the administrative region Marburg/Maribor.
Thesen was formerly part of the German Empire. In the German Empire, the place was called Thesen (Marburg a. d. D.-Thesen). The place is now called Tezno (Maribor-Tezno) and belongs to Slovenia.