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In page Charlemagne:

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The Carolingian king exercised the bannum, the right to rule and command. Under the Franks, it was a royal prerogative but could be delegated.[1] He had supreme jurisdiction in judicial matters, made legislation, led the army, and protected both the Church and the poor. His administration was an attempt to organise the kingdom, church and nobility around him. As an administrator, Charlemagne stands out for his many reforms: monetary, governmental, military, cultural and ecclesiastical. He is the main protagonist of the "Carolingian Renaissance".