The Slavic population gradually assimilated in the Republic of Macedonia .
Exceptions are Greece , where because Slavs were fewer than Greeks , they came to be Hellenized ( aided in time by more Greeks returning to Greece in the 9th century and the role of the church and administration ) ; and Romania , where Slavic people settled en route for present-day Greece , Republic of Macedonia , Bulgaria and East Thrace , where the Slavic population gradually assimilated .
Slavs