Answer: Charles the Great.
Explanation:
Charlemagne has crowned Christmas in 800 AD. The ecclesiastical question was the most important in Europe in those decades, and Charles the Great was the most capable ruler in Europe.
Consequently, the pope turned to the ruler of the enormous European Empire at that moment. Some historians also call him the "Greatest Christian of all time."
The answer would choice C, between the Tigris and Euphrates rivers.
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An important contribution of enslaved Africans employed in large-scale, specialized production of commodities in the Americas is the development of price-making markets across the Atlantic basin in regions (including Western Europe) that had long been dominated by non-market-oriented production.
