Mauterndorf Castle (German: Burg Mauterndorf) is a castle in the municipality of Mauterndorf, in the Austrian state of Salzburg. Mautendorf Castle was probably built on the site of an old Roman fort that dates to AD 326 or earlier. The fort had protected the Roman mountain road from Teurnia via Radstädter Tauern Pass to Iuvavum (present-day Salzburg) and served as a residence for the Roman administrator in the Noricum province. The original fort was destroyed during the Migration Period. A castle built on the site in later years was funded and supported by a toll (German: Maut) collection system for the nearby road. The toll system on the Radtsädter Tauern Pass road supported the castle and village until 1803 when the toll collection was abandoned during the Napoleonic Wars. In 1806 the castle became a possession of the Austrian state. In 1894 the Mautendorf Castle was purchased by Hermann Epenstein (1851–1934), a Christian of Jewish descent, who served as a Prussian Army surgeon in Berlin. He refurbished and restored the decayed castle with great effort for use as a residence. In 1908 he obtained the minor title of a Ritter von Mauternburg from the Austrian emperor Franz Joseph I for his meritorious services and donation to the Crown. During his service in German South-West Africa in the late 1880s, Epenstein had become friends with Commissioner Heinrich Ernst Göring. Back in Germany, he offered the Göring family hospitality in his residences. He became the attending physician (and only slightly hidden lover) of Göring's wife Franziska, as well as the godfather and mentor of his children. The Göring family, among them the younger sons Hermann and Albert, frequently stayed at Mauterndorf Castle as Epenstein's guests. Epenstein later became a naturalized Austrian citizen and retired after World War I to live in Mauterndorf. In 1923 he received Hermann Göring who had fled from Germany after the failed Beer Hall Putsch to evade criminal prosecution.