What was the main thing in the activities of Charlemagne?

Charlemagne sought to create an empire that could become the successor to the Roman Empire. As a result of prolonged military conflicts, he succeeded. He expanded the original boundaries of his state several times. His possession included present-day France, part of Germany, Italy, Spain. Charlemagne positioned himself as the protector of the Holy See in Rome.
Karl also took care of the internal improvement of his lands. He developed education, under him construction was carried out, public administration reforms were carried out.