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In page Charlemagne:

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By 774, Charlemagne had invaded the Kingdom of Lombardy, and he later annexed the Lombardian territories and assumed its crown, placing the Papal States under Frankish protection.[1] The Duchy of Spoleto south of Rome was acquired in 774, while in the central western parts of Europe, the Duchy of Bavaria was absorbed and the Bavarian policy continued of establishing tributary marches, (borders protected in return for tribute or taxes) among the Slavic Serbs and Czechs. The remaining power confronting the Franks in the east were the Avars. However, Charlemagne acquired other Slavic areas, including Bohemia, Moravia, Austria and Croatia.[1]