Die Information in Wikipedia ist nicht sehr ausführlich, aber es könnte einige allgemeine Hinweise geben. Leider auf Englisch.
http://en.wikipedia.org/wiki/Omurtag
http://en.wikipedia.org/wiki/Omurtag
“In 818 the Slavic tribes of the Timočani, Abodrites, and Braničevci rebelled against the increasingly onerous Bulgarian suzerainty in the west and sought the support of the Frankish Emperor Louis the Pious. In 824 and 825 Omurtag approached the Frankish court with an attempt to seek a diplomatic resolution of the problem. Failing to gain Frankish co-operation, Omurtag issued an ultimatum in 826 and in 827 sent a fleet along the Danube (Sava river und nördlich)/mein Zusatz/, which restored Bulgarian control over portions of southeastern Pannonia.”
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