The Origin of European Unity Europe was united at several times in the past, mainly in classical times Europe was united at several times in the past, mainly in classical times Roman Empire Roman Empire Christendom Christendom Successors like Charlemagne, Habsburgs claim title of Holy Roman Emperor - just as various rulers in the Islamic world claimed to be Caliph Successors like Charlemagne, Habsburgs claim title of Holy Roman Emperor - just as various rulers in the Islamic world claimed to be Caliph Europe replaces Christendom as key idea, c 1300-1350 Europe replaces Christendom as key idea, c 1300-1350
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