Burgruine Aggstein is the remnant of a castle on the right bank of the Danube, north of Melk. According to archaeological excavations of the foundations of the castle it has been inferred that the castle was built in the early part of the 12th century. The castle was built by Manegold III Aggsbach Getbeen of the Kuenringer family descent and his son Aggstein Manegold IV inherited it as a fiefdom of Bavaria. They started living in the castle from 1180 onwards. Its notoriety was due to the 'robber barons' of Schloss Schonbuhel and Burg Agstein' who imprisoned their rivals for ransom and tied them to a rock ledge all the time threatening to kill them by throwing them into the gorge. In 1181, it came into the possession of the Kuenringer Aggsbach-Gansbach. The castle was besieged during the revolt of the Austrian nobility against Duke Albrecht I in 1295/96. Kuenringer Leutold occupied the castle from 1348 to 1355 and then it fell into disrepair.
In 1429, Duke Albrecht V pledged to rebuild the ruined castle because of its strategical point on the Danube. The purpose was to collect taxes from passing boats. In 1438, he built a riverbank toll house to regulate shipping on the Danube and used it as a front to accumulate wealth by robbery from ships. Later, another dishonest baron, Georg von Stain, occupied the castle but in 1476 he was caught and expelled and was forced to surrender the castle. Duke Leopold III took over the castle in 1477. It was occupied with tenants and carers in order to stop the looting which had taken place on the river in previous decades.
In 1529, the castle was burned down by a group of Turks during the first Turkish siege of Vienna. It was rebuilt and provided with loopholes for defence with the help of artillery. In 1606, Anna Baroness acquired the castle, but after her death, the castle was neglected. In 1685, the castle became the property of Count Ernst Rüdiger von Starhemberg. Then in 1819, one of his descendants, Ludwig Josef Gregor von Starhemberg, sold the castle to Count Franz von Beroldingen who renovated the castle in the 19th century. The Beroldingen family owned the castle until 1930 when the estate and the ruins of Schönbühel Aggstein were sold to Count Oswald von Seilern Aspang.References:
Medvedgrad is a medieval fortified town located on the south slopes of Medvednica mountain, approximately halfway from the Croatian capital Zagreb to the mountain top Sljeme. For defensive purposes it was built on a hill, Mali Plazur, that is a spur of the main ridge of the mountain that overlooks the city. On a clear day the castle can be seen from far away, especially the high main tower. Below the main tower of the castle is Oltar Domovine (Altar of the homeland) which is dedicated to Croatian soldiers killed in the Croatian War of Independence.
In 1242, Mongols invaded Zagreb. The city was destroyed and burned to the ground. This prompted the building of Medvedgrad. Encouraged by Pope Innocent IV, Philip Türje, bishop of Zagreb, built the fortress between 1249 and 1254. It was later owned by bans of Slavonia. Notable Croatian and Hungarian poet and ban of Slavonia Janus Pannonius (Ivan Česmički) died in the Medvedgrad castle on March 27, 1472.
The last Medvedgrad owners and inhabitants was the Gregorijanec family, who gained possession of Medvedgrad in 1562. In 1574, the walls of Medvedgrad were reinforced, but after the 1590 Neulengbach earthquake, the fortress was heavily damaged and ultimately abandoned. It remained in ruins until the late 20th century, when it was partly restored and now offers a panoramic view of the city from an altitude of over 500 meters.