Aggstein Castle (German: Burgruine Aggstein, lit. "castle ruins of Aggstein") is a ruined castle on the right bank of the Danube in Wachau, Austria. The castle dates to the 12th century. Aggstein Castle is 480 metres (1,570 ft) above sea level.
The castle ruins are situated at about 300 metres (980 ft) above the right bank of the Danube on an outcrop running from east to west. It is some 150 metres (490 ft) long and has a rock structure at both ends. The ruins are located within the municipality of Schönbühel-Aggsbach in the Melk District of Lower Austria.
The castle was probably built at the beginning of the 12th century by Manegold III of Acchispach (Aggsbach). In 1181, it came into the possession of the Kuenring family of Aggsbach-Gansbach. It was besieged and conquered in 1230/31 during the uprising led by Hadmar III and his vassals against Duke Frederick II of Austria. In the disputes over the succession of Frederick II, or herrscherlosen Zeit (the "time without a ruler"), the Kuenrings switched sides a few times. Thus Leutold Kuenring outmanoeuvred the Austrian nobility in their revolt against Duke Albert: subsequently, the castle was besieged and conquered in turn in 1295/96. The last Kuenring, Leutold II, held the castle from 1348 to 1355. After that it fell into disrepair.
In 1429, Duke Albert V withdrew the castle from Maissauer's stewardship, and assigned it to his chamberlain, Jörg (Georg) Scheck von Wald. Albrecht commissioned him to rebuild the ruined castle to secure the passage of ships on the Danube. In 1438 Scheck von Wald received...