Leo III

Leo III was pope from 795 to 816, best known for crowning Charlemagne as Emperor of the Romans in 800, an event that symbolized the alliance between the papacy and the Frankish monarchy. His papacy helped establish the foundation of the medieval Church's temporal power and influence within Europe. Leo's reign was marked by political turmoil and conflict, but his legacy is largely tied to the strengthening of the Church's role in European governance.