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This is incorrect. Medieval Romanians were not speakers of Bulgarian (OCS). However, educated Romanians (which were a tiny minority) did speak Old Bulgarian. This is because OCS was the liturgical language in the Romanian principalities, and education was done in the liturgical language everywhere in Europe until the spread of print (15th century). 15th and 16th century are a transitional period when education and administration happened in both languages, but predominantly in Bulgarian, then in the 17th century Romanian displaced Bulgarian completely (in Church and administration).
All this time though, the average peasant Romanian did not understand Bulgarian save for a few words that entered the basic vocabulary (like nevasta etc). Romanians and Bulgarians have diverged culturally by year 1000, when Bulgarians favored a Slavic culture and Romanians a Romance culture. However, the genetic overlap the Romanians have with Bulgarians and Serbs remains large to this day.
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