Leo IV "the Khazar" of the Isaurian Dynasty rule from 775-780 at a crucial point in the empire following the death of his father Constantine V. He had invaded Abbasid Caliphate in Syria and winning some minor victories as well as taking some loot and Jacobites to resettle in Thrace. However, he would die in 780 from a violent fever of which was caused by his tuberculosis and he would later die. This would lead to his nine year old son, Constantine VI, taking the throne with his mother as regent and eventually, this mess would lead to the coronation of Charlemagne as Holy Roman Emperor. The obvious PoD here is that Leo IV never contracts TB and thus lives to at least his late 60s up to the 810s. What would be the effect on the Roman Empire at this time had he reigned for another 37 or so years? Could he have effectively crippled and causes a civil war in the Abbasid Caliphate with a few victory and nab Syria and possibly Egypt back? How would he go about with possible expansion into Italy if he chooses to do so? Finally, what would the effect be on the Frankish Empire of Charlemagne as this most likely prevents the Holy Roman Empire from being declared anytime soon? What does Charlemagne's succession look like now with the idea of the HRE out of the picture if he doesn't still own it ittl? And who does C6 marry ittl?
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