Originally posted by Razer
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Khazar Khans letter written in 10th century;
Arab traveler named Ibn Fadlan goes to the Volga region in 10th century to islamize them. Read this and see what language Volga Bulgars speaks in 920 AD and who are they;
For western chronicles of medieval era, read Plemen Tzvetkov`s article;
For Cyril&Methodius`s own words about Bulgars from their autobiography written in 9th century;
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