His territory initially spanned between the Drava and Sava , which he held under the overlordship of Arnulf of Carinthia .
Braslav was the Duke of Lower Pannonia between 884 and 896 .
Braslav 's territory initially spanned between the Drava and Sava , which he held under the overlordship of Arnulf of Carinthia .
Braslav was the Duke of Lower Pannonia between 884 and 896 .