The Byzantine emperor ordered all icons destroyed and the pope disagreed which led to Charlemagne the Holy Roman Emperor.
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The Roman emperor had to answer to the pope.
He created a central government for Western Europe.
Charles VII became the holy Roman Emperor in 1519.
The roman emperor Hadrian had a wall built in Scotland.
Otto I the Great, Holy Roman Emperor (lived 912-973, reigned 936-973). The Holy Roman Emperor was ruler of the Holy Roman Empire, a predecessor of numerous countries mainly in central Europe.