Two historical highpoints define this century.
Charlemagne is Crowned Holy Roman Emperor
The alliance between the Franks and papacy continued to develop. It reached a climax in the year 800 AD when Pope Leo III crowned Charlemagne, King of the Franks, Holy Roman Emperor. The coronation ceremony was the beginning of an alliance that would exist between Church and State for centuries.
Apostles to the Slavs
With the death of Charlemagne, the Empire experienced both political and social upheaval. This upheaval did not discourage Saints Cyril and Methodius from evangelizing the Slavic people. In 863 AD they started their mission and through their efforts many Slavs were converted. Their method for evangelizing was revolutionary. Instead of giving the people liturgical texts and holy books in Latin, which was the official language of the Church, they translated everything into the Slavonic language.