Final answer:
Charlemagne, known as Charles the Great, was the Carolingian ruler who was first named Holy Roman Emperor by Pope Leo III in 800, uniting Western Europe under his rule.
Explanation:
Charlemagne, also known as Charles the Great, was the Carolingian ruler who was first named Holy Roman Emperor. He was crowned Emperor of the Romans by Pope Leo III in the year 800, marking a significant event in European history.
Charlemagne's empire extended from modern France to Germany, northern Italy, parts of Spain, and central Europe, uniting Western Europe for the first time since the fall of the Western Roman Empire.
His coronation as Emperor of the Romans by the Pope led to conflicts with Byzantine rulers but also established the Carolingians as powerful rulers in the Frankish kingdom.
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