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In page Bitola:

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In the 6th and 7th centuries, the region around Bitola experienced a demographic shift as more and more Slavic tribes settled in the area. In place of the deserted theater, several houses were built during that time. The Slavs also built a fortress around their settlement. Bitola was a part of the First Bulgarian Empire from the middle of the 8th to the early 11th centuries, after which it again became part of the Byzantine Empire, and in turn was briefly part of the Serbian Empire during the 14th century. Arguably, a number of monasteries and churches were built in and around the city during the Medieval period (hence its other name Manastir).[citation needed]