Teurnia was a Roman city in western Carinthia. In late antiquity it was also a bishop's see, and towards the end of Roman times it was mentioned as the capital of the province of Noricum mediterraneum.
As early as 1100 BC, people had lived there on Holzerberg hill, which may well have also been the centre of the Celtic Taurisci nation. Before c. 50 AD the Roman town was built with a forum, a market basilica, a temple on the city's Capitol, Thermae or public baths, terraced housing on two terraces, and a temple dedicated to Grannus, the Celtic counterpart deity of Aesculap, god of medicine and healing, but in Teurnia invoked as Grannus Apollo. Usually older hill-top settlements were moved by the Romans to lower-lying areas with the one exception of the oppidum at Teurnia in the tribal region of the Ambidravi, where old names are said to have been retained and no renaming took place.
Teurnia was one of the largest places in all Noricum with, in its peak period, a population of 30,000. Towards the end of the Empire the population decreased; people left the housing terraces, and the slopes being no longer suitable for agriculture were used as cemeteries. At the same time walls went up surrounding the hilltop with material from the deserted houses.
By the 4th century, Teurnia was already a Christian town and it was a bishop's see until the city's decline and its end in 610.
Holzerberg hill was a well-known place of antique finds as early as the Middle Ages. Professional excavations began with the accidental discovery of the cemetery church in 1908. The mosaic of its donor, the praeses or governor Ursus, in the right side-chapel of the three-naved basilica is in near-perfect preservation. In twelve pictures the mosaic shows christological, mythological and biblical symbols as well as the names of one Ursus, the donor, and his spouse, Ursina.
In 1984, the Early-Christian bishop's church was discovered, which has now been roofed over and is open to visitors. The episcopal church was built at the beginning of the 5th century and a century later, after a destructive fire, was rebuilt in basilica style with three naves and three apses.
In the village centre of St. Peter-in-Holz there is a recent 'Römer-Museum' exhibiting numerous artefacts from the city area of Teurnia. Nearby are the preserved remains of a Roman town villa or villa urbana boasting a simple hypocaust in form of the letter Y. Next to the bishop's church the Hospitium, the bishop's guest house, was found, but for protection purposes it has been covered with soil again. More excavation work is going on. Information on the city's history and the excavation work is provided in display cases all over the area.References:
The Petersberg Citadel is one of the largest extant early-modern citadels in Europe and covers the whole north-western part of the Erfurt city centre. It was built after 1665 on Petersberg hill and was in military use until 1963. It dates from a time when Erfurt was ruled by the Electors of Mainz and is a unique example of the European style of fortress construction. Beneath the citadel is an underground maze of passageways that can be visited on guided tours organised by Erfurt Tourist Office.
The citadel was originally built on the site of a medieval Benedictine Monastery and the earliest parts of the complex date from the 12th century. Erfurt has also been ruled by Sweden, Prussia, Napoleon, the German Empire, the Nazis, and post-World War II Soviet occupying forces, and it was part of the German Democratic Republic (East Germany). All of these regimes used Petersberg Citadel and had an influence on its development. The baroque fortress was in military use until 1963. Since German reunification in 1990, the citadel has undergone significant restoration and it is now open to the public as a historic site.