The Church of Saint Paraskevi (, tsarkva „Sveta Paraskeva“, Byzantine Greek: Ναός Αγίας Παρασκευής) is a partially preserved medieval Eastern Orthodox church in Nesebar (medieval Mesembria), a town on the Black Sea coast of Burgas Province in eastern Bulgaria. It was most likely built in the 13th or 14th century and forms part of the Ancient Nesebar UNESCO World Heritage Site. The Church of Saint Paraskevi features a single nave and a pentagonal apse as well as rich exterior decoration. Its dome and the belfry surmounting the narthex have not been preserved today, and it is unknown which of the three saints named Paraskevi it was dedicated to. History The dating of the Church of Saint Paraskevi is disputed. While some researchers ascribe its original construction to the 10th century, it is generally held that it was built in the 13th–14th century. This estimate is based on its architectural similarities to churches of that period in the medieval Bulgarian capital Veliko Tarnovo. Rough Guides author Jonathan Bousfield attributes its construction to the reign of Tsar Ivan Alexander of Bulgaria (r. 1331–1371). However, during this period Nesebar changed hands multiple times between the Second Bulgarian Empire and Byzantium. Along with other architectural sites in the old town of Nesebar, the church forms part of the Ancient City of Nesebar UNESCO World Heritage Site and the 100 Tourist Sites of Bulgaria. It was listed among Bulgaria's monuments of culture of national importance in 1964. It is not an active church today, though it remains in use and houses an art gallery. It remains uncertain which of the saints known as Paraskevi the church was dedicated to. Early Christian martyrs Paraskevi of Rome and Paraskevi of Iconium were better known in the Byzantine Empire and particularly its capital Constantinople, though Paraskevi of Epibatos was more popular in Bulgaria and was recognised by Ivan Alexander as his personal patron. Scholar Bistra Nikolova believes the former two options to be more likely. Architecture and decoration The Church of Saint Paraskevi is a single-nave church, measuring , or and built according to the Byzantine cross-in-square design. It features a narthex in its western part and a single wide pentagonal apse in its eastern section. The church was built out of bricks and smoothed stones and based on a pseudo-opus mixtum technique which also employed wooden beams. The nave was barrel-vaulted by two arches. The church does