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What if instead of Muhammad uniting the Arab tribes under the banner of Islam in the 7th century (let's say Muhammad dies a sickly infant), a Genghis Khan/Temujin-esque figure had united the Arab tribes under his banner and launched a campaign of expansion against the weakened Byzantine and Sassanian Empires? Would they be more successful or less successful than the Islamic Caliphate in expanding against Rhomania and Eranshahr? What would the impact of the Arab invasions of Byzantium and the Sassanians being more like the Mongol expansions be on the history of the world?