Close, as the Catholic Church appointed him Emperor of the Holy Roman Empire. The Roman Empire of the West ceased to exist by 476 CE, after which the Eastern Empire, based in Constantinople and also known for historical reasons as the Roman Empire, was the sole remnant of past glories.
On Christmas Day 800, Charlemagne, king of the Franks, was crowned in Rome by Pope Leo III with the title of Holy Roman Emperor. Leo not only crowned Charlemagne, he kneeled before him.
The effect was to replace the Emperor in Constantinople as the temporal protector of the Church in the West and signalled an end to the Eastern Emperor's involvement in Western affairs. It was intended by the addition of the word 'Holy' to forge a definitive link between the papacy and Charlemagne's empire.
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