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Entire Black Sea region had been colonized by Greek/Greek-speaking merchantile populations since antiquity and continued to do so in the middle-ages until the population exchange with Bulgaria.
You may find as many original Slavic toponyms there as you may find in Peloponnese.
People from Skopje speak a Bulgarian dialect and their history is Tsar Samuel, naturally as South-West Bulgarians they would have some affinity to their neighbors.
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