One Swiker , Lord of Hollenburg in the Duchy of Carinthia was first documented as a witness in the 1142 deed of the foundation of Viktring Abbey . He may have been a liensman of the ducal House of Sponheim ; his son Reginher is mentioned as Lord of Steuerberg , he accompanied King Conrad III of Germany on the Second Crusade in 1147 and later appeared as a ministerialis of Margrave Ottokar IV of Styria . The castle was of strategical importance due to its location at a Drava river crossing and the road to the Loibl Pass and the March of Carniola . Upon the extinction of the Hollenburg dynasty in 1246 , it passed to the Styrian Lords of Pettau , in 1438 it was inherited by the House of Stubenberg . The structure had been severely damaged by the 1348 Friuli earthquake
1348 Friuli earthquake
1348 Friuli earthquake
Schloss Hollenburg