The Church of Saint Sofia is an Eastern Orthodox church in Nesebar, eastern Bulgaria It is situated in the old quarter of the town which is part of the UNESCO World Heritage Site list and of the 100 Tourist Sites of Bulgaria.
The church is located in what is supposed to have been the center of the ancient city. It is a three-naved unvaulted basilica with a semi-circular apse, a narthex and an atrium. The church has a total length of 25.5 m and a width of 13 m. The division into three naves was effected by two rows of five pillars each. The middle nave ends to the east with a big closed apse, round outside and three-sided inside. There are three arched windows on the eastern wall above the apse. The basilica used to have a double-sloped roof which has not been preserved. From the inside the church used to be plastered and then painted with frescoes. The whole floor used to be covered with mosaics made out with little coloured stones. It has mixed masonry of stone and brick and is the largest of the Nesebar churches whose overground structure has survived.
The basilica was constructed in the late 5th and early 6th century. Its present appearance was dated from the beginning of the 9th century when it was reconstructed. During the Middle Ages it served as a cathedral for the bishopric eparchy centered in Nesebar. In 1257 the church was looted by the Venetians during a campaign against the Bulgarian Empire and many religious relics were taken in the Church of San Salvatore in Venice. The basilica was abandoned in the 18th century.
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.