He has been crowned by the Pope in Rome.

With this coronation in the year 800 A.D. Charles became the emperor of Europe.

His empire included Italy, France, Germany up to the Oder river. As the leader of a Christian nation he expected from his subjects to turn towards the Christian faith.

The people of Saxony refused to accept the new faith. After the third campaign they conceded finally. Their leader Widukind converted to the Christian faith.

In spite of being forced his conversion has been true.  This forged peace with the Saxon people has been of duration.