Pannonian Croatia
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Pannonian Croatia (Croatian: Panonska Hrvatska) was a medieval duchy located in the Pannonian Plain between rivers Drava and Sava. Capital of Pannonian Croatia was Sisak. It was established in the 9th century after rebellion of prince Ljudevit Posavski against his Frankish rulers. In the 10th century, Pannonian Croatia united with Littoral Croatia to form the Kingdom of Croatia.