Until the year 865 a. d., the dominant language of where today is called Bulgaria was Turkic Bulgar, then the Catholic Church picked the minority Slavic language for liturgy which eventually became the only language as the Bulgars assimilated into the Slavic culture and language, of the ancient Thracians who first inhabited the land on the west side of the Black Sea basin, the Turkic Bulgars moved in when the Ice Age ended and many of the Thracians spread northward with their “Slavic” language.