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It was not Bulgars' fault if Slavs did not have a noble caste back then. Turkic folks (along with Mongols) were ''Germans of the Orient'' in many aspects, including providing Oriental cultures and states with their upper class, military elites and ruling dynasties.
You must not forget how much Avars and Bulgars contributed to Slavic folks, not only in their spread all over the place, but also Bulgar state providing Slavonic Orthodox culture.
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