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In page History of Austria:

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The Carantanians migrated westward along the Drava into the Eastern Alps in the wake of the expansion of their Avar overlords during the 7th century, mixed with the Celto-Romanic population, and established the realm of Carantania (later Carinthia), which covered much of eastern and central Austrian territory and was the first independent Slavic state in Europe, centered at Zollfeld.[citation needed] Together with the indigenous population they were able to resist further encroachment of the neighboring Franks and Avars in the southeastern Alps.