In the 15th century, the Ottoman Turks brought an end to the Byzantine Empire. Among the last to fall were the small towns on the Black Sea, one of which, Sozopol, is the site of the recent discovery of a late Byzantine church.
The 14th century St. Apostles monastery was constructed by Anasthasius Palaiologos, uncle of the Byzantine Emperor John V Palaiologos. It was found, along with a small chapel and a feudal castle by a team led by Dr. Krastina Panayotova from the National Archaeology Institute of the Bulgarian Academy of Sciences.