The first small Starhemberg castle was built by Ottokar III, Margrave of Styria between 1140 and 1145. At the time, the Piesting river was the border between Styria and the March of Austria. In 1192, Styria—and, thus, the castle—was acquired by the Babenbergs. The last Babenberger duke of Austria, Frederick II the Warlike, expanded and fortified the castle, leaving Starhemberg as one of the most important castles in Lower Austria in the 13th century. In wartime, the archives and the family treasure was hidden here, and were guarded by the Teutonic Knights.
After the Battle on the Marchfeld in 1278, the castle was acquired by the Habsburgs. In 1482, the castle was captured by Matthias Corvinus, king of Hungary. In 1683, the castle offered protection from the Turks to the surrounding population.
To escape a new roof-tax the counts of Heusenstamm around 1800 had the roof covering removed, as well as doors and window frames, beginning the decline of the castle. Around 1870, a large part of the great hall collapsed. Until the mid-20th century, the ruins were used for the extraction of construction materials by the local population.
In the spring of 1945 a unit of the Waffen-SS used the ruined tower above the chapel as an observation post. Russian artillery fire inflicted heavy damage to the walls.
In the second half of the 20th century a local organisation, Friends of the Castle Starhemberg, has sought to restore the ruins. Since 2007, the castle has been closed to visitors, for security.
References:The Church of St Donatus name refers to Donatus of Zadar, who began construction on this church in the 9th century and ended it on the northeastern part of the Roman forum. It is the largest Pre-Romanesque building in Croatia.
The beginning of the building of the church was placed to the second half of the 8th century, and it is supposed to have been completed in the 9th century. The Zadar bishop and diplomat Donat (8th and 9th centuries) is credited with the building of the church. He led the representations of the Dalmatian cities to Constantinople and Charles the Great, which is why this church bears slight resemblance to Charlemagne's court chapels, especially the one in Aachen, and also to the Basilica of San Vitale in Ravenna. It belongs to the Pre-Romanesque architectural period.
The circular church, formerly domed, is 27 m high and is characterised by simplicity and technical primitivism.