a monolithic, cubic altar. The area of the bema is slightly heightened by two elevations of the floor. The main entrance is situated in the west, while there is one door each in the lateral walls. The northern one is almost at the height of the windows as this side of the church is limited by a slope. All three entrances are completed by a lunette and two archivolts. High up in the northern and southern walls are two windows located, each with round arches. Another pair is situated in the apse, while a seventh one can be found in the western gable zone. Two rectangular screens ensure incidence of light in the south wall. The apse is flanked by one rectangular niche on each side, functioning symbolically as prothesis and diaconicon. Two rectangular deepenings are situated in the side walls of the bema zone. The one in the south is bricked-up and clearly positioned lower than its counterpart, but still taking away part of the painting of a bishop. The walls consist of roughly trimmed stone, combined by mortar. Flatter stones and bricks are used irregularly around the lunettes and windows as well as for the apse. In the upper two-thirds of the eastern wall are two horizontal registers of brick incorporated, which reminds of the cloisonné technique, whereas the lower part is performed coarsely. Since the 11th century the facades of religious buildings in the Byzantine empire are designed more vividly and loosened up by niches, bricks and friezes. Especially the masonry in Kastoria was decorated by pricks forming patterns. Also the lunette with the double archivolt was very common in Byzantine architecture since the 11th century. Frescos Facade The church is not only decorated with paintings on the interior, but also on the facade. The cloisonné technique was used for the frescos on the western side imitating brickwork up to the height of the door lintel. Further brick mimicries can be found in the lower zone of the apse and the first archivolt of the southern door. The rest of the paintings are strongly washed out. Better preserved are the rider saints with their halos, shields and lances, who are flanking the western lunette. Above the left saint are the remains of two figures with splendid clothing and imperial footwear, above its counterpart another person can be noticed. A two-lined inscription is written on the first archivolt