The Karolus magnus et Leo papa (Classical Latin: [ˈkarɔlʊz ˈmaŋnʊs ɛt ˈlɛ.oː ˈpaːpa], Ecclesiastical Latin: [ˈkaːroluz ˈmaɲɲus ɛt ˈlɛːo ˈpaːpa]; lit. "Charles the Great and Pope Leo"), 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.