The Church of St John Aliturgetos is located in Nesebar. The church was not consecrated, hence the name - aliturgetos is the Greek for 'not consecrated'. The legend says that one of the builders fell down and was killed. The church canon did not allow a place where a man had been killed to be used for worship, but according to some records services were held in it.
The church was badly damaged during the 1913 earthquake. Its ruins in the southern part of the peninsula show that it must have been one of the most beautiful medieval churches in Nesebar. It is a domed cruciform church with three altar apses and a narthex. It is 18.5 m long and 10 m wide. The base of the cruciform part of the church is almost quadrangular, shaped by four columns. It has mixed masonry: stone and brick; the facade walls are segmented by blind two-step niches decorated with various geometrical patterns from bricks and stone cubes (ceramic plastic style).
The church was built in the 14th century; it has two entrances, from the north and south, which is rare in the architecture of church buildings.
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.