A fundamental tenet of the autochthonous theory is that the Bulgars that were actually Bulgarians are not settlers in Europe, but people who have inhabited the Balkans since antiquity.
That is, they as a people, although they had different names in different historical epochs, are actually direct descendants of indigenous tribes such as Thracians, Illyrians, Macedones, Getae etc., who lived on the same territory.
[5] This theory, though denied and rejected as a marginal one, has its supporters and theorists in its various variations today as Georgi Rakovski and Gancho Tsenov have been rediscovered.
Thracians are considered simply ancestors of the modern Bulgarians and their continuity is projected to the prehistoric times.
[7] Some modern Bulgarian researchers have attempted to prove the deception that the "Ezerovo ring" inscription, written with Greek letters in the Thracian language,[8] is in fact in Slavic language, close to modern Bulgarian and that it was not the Greek alphabet, but the original script of the ancient Thracians.