St. Nicholas Monastery Church (Albanian: Kisha e Manastirit të Shën Kollit, Greek: Καθολικό Ιεράς Μονής Αγίου Νικολάου) is the katholikon of the abandoned Orthodox monastery of Saint George in Mesopotam, Vlorë County, Albania.
The monastery is thought to have been built in 1224 or 1225. It was once enclosed by a circular wall which is today only partly preserved.[1] Its double apse makes it unique in its genre, and it is thought of as this was due to the monastery being used by two religious rites (Catholic and Orthodox).[2] The East–West Schism of 1054 appears not to have deterred the Catholic and Orthodox believers in Mesopotam, evidently successful in finding a compromise that enabled them to work together in the construction of the monastery.
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