The Liebfrauenkirche (German for Church of Our Lady) is, along with the Cathedral of Magdeburg the earliest Gothic church in Germany and falls into the architectural tradition of the French Gothic cathedrals. It is designated as part of the Roman Monuments, Cathedral of St. Peter and Church of Our Lady in Trier UNESCO World Heritage Site.
A Roman double church originally stood here. The southern portion was torn down around 1200 and completely replaced by the Early Gothic Church of Our Lady (Liebfrauen). The exact date of the start of construction can no longer be determined, however a painted inscription inside on a column in the church reads: 'The construction of this church was started in 1227 and ended in 1243'. However, it is currently thought construction began in 1230 by Archbishop of Trier Theodoric II.
Around 1260, the building was probably finished. In 1492, a high peak was placed on the central tower, which was named because of its high technology and degree of craftsmanship perfection. The high peak can be seen on the city dating, but was destroyed in a storm on Heimsuchungstag (July 2) in 1631. Subsequently a hipped roof emplaced, which was destroyed in the Second World War. It was first replaced in 1945 by a roof and then by a steeper one in 2003.
A special feature of the basilica is its atypical cruciform floor plan as a round church, whose cross-shaped vaulting with four corresponding portals in rounded niches is completed by eight rounded altar niches so that the floor plan resembles a twelve-petaled rose, a symbol of the Virgin Mary, the rosa mystica, and reminiscent of the twelve tribes of Israel and the Twelve Apostles. The apostles as well as the twelve articles of the Apostle's Creed are painted on the twelve supporting columns, completely visible only from one spot marked by a black stone.
Though nothing above the surface is Roman any longer, but there are extensive excavations (not open to the public) underneath the church and several of the Gothic pillars stand on top of Roman column foundations.
References:Sigmaringen Castle was first mentioned in the year 1077 in the chronicles of Petershausen monastery. The oldest parts of the castle are concealed beneath the alterations made during the 17th and the 19th centuries. The secret of the earliest settlement built on this defendable rock will never be fully revealed: large-scale excavation work would be necessary, which the extensive land development renders impossible. Judging from the many Roman remains unearthed in the area around Sigmaringen, the 12th century keep known as the 'Roman Tower' could be traced back to a Roman predecessor.
The castle remains that have been preserved (gate, great hall and keep) date back to the Staufer period around 1200. The castle remains were integrated into subsequent buildings. The foundations of the castle buildings are to a large extent identical to the surrounding castle wall.
These remains give us a good idea of how the castle might have looked during the 12th century.