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Pope Leo III was attacked by partisans of his predecessor Adrian I, but was rescued and taken to Charlemagne, as described in the epic Karolus magnus et Leo papa.
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Pope Leo III
Head of the Catholic Church from 795 to 816
Pope Leo III was bishop of Rome and ruler of the Papal States from 26 December 795 to his death on 12 June 816. Protected by Charlemagne from the supporters of his predecessor, Adrian I, Leo subsequently strengthened Charlemagne's position by crowning him emperor. The coronation…Source: Wikipedia (CC BY-SA)
Pope Adrian I
Head of the Catholic Church from 772 to 795
Pope Adrian I was the bishop of Rome and ruler of the Papal States from 1 February 772 until his death on 25 December 795. Descended from a family of the military aristocracy of Rome known as domini de via Lata, he was the son of Theodore, who died when Hadrian was still very…Source: Wikipedia (CC BY-SA)
Charlemagne
King of the Franks and first Holy Roman Emperor (748–814)
Charlemagne was King of the Franks from 768, King of the Lombards from 774, and Emperor of what is now known as the Carolingian Empire from 800. He united most of Western and Central Europe, and was the first recognised emperor to rule from the west after the fall of the Western…Source: Wikipedia (CC BY-SA)
Karolus magnus et Leo papa
9th-century Latin poem
The Karolus magnus et Leo papa, sometimes called the Paderborn Epic or the Aachen Epic, is a Carolingian Latin epic poem of which only the third of four books is extant. It recounts the meeting of Charlemagne, king of the Franks, with Pope Leo III, in AD 799.Source: Wikipedia (CC BY-SA)