The Holy Roman Emperor also had 2 ancillary titles. King of Germany and King of the Romans. After Charlemagne the title of HRE and king of the Romans was passed around by his grand-sons descendants. It end up with the elected king of the Germans also being HRE. With a stipulation that it was only official if you crowned by the Pope in Rome. Electors were the original dukes of the German tribal duchies. After the 15th century no HRE really bothered going to Rome for a coronation. But the late dark age idea that the Pope had the authority to make Emperors is why Napoleon had the Pope crown him Emperor.
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