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What if, whether he still dies in 775 or not, Emperor Constantine V manages to defeat the Bulgars so badly that he reestablishes the Danube river border in the north? What would such a victory have mean for Constantine, his dynasty, the empire and Iconoclasm?

In such a scenario, where would the Romans have turned to next - Southern Italy? Asia Minor? Syria? The Slavic tribes in former Dalmatia & Pannonia? Tunisia?

And finally, out of curiosity, how well would Byzantine iconoclasm have given itself to proselytisation?

Any thoughts?
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