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The Franks and the Byzantines fought in Italy and Dalmatia for about a decade against each other (under the rule of Nicophorus) ? What if the hostilities had become more severe , the Byzantine Empire never accept Charlemagne as Emperor in the West and he in return never cedes Venice, Istria and Dalmatia to the Byzantines (maybe an earlier shism than 1054 included) , with the Frankish Emperor deciding to settle the West-East conflict for Roman-Christian heritage once and for all (with Pope´s blessing) ? Would he fail ? How would a siege look like, if Frankish Empire besieges the Eastern Roman capital ? How would the Abbasids respond ?
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