Answer:
It established the Church as a political force.
Step-by-step explanation:
Charlemagne was crowned Emperor of Romans on Christmas Day of 800 A.D. He was crowned by Pope Leo III, on the Basilica of St. Peter in Rome.
With the coronation Pope Leo III was able to give the church authority over the empire. Leo III aimed to have the right to appoint the Emperor of the Romans and establishing the imperial crown as his gift.
With this, he had superiority over the Emperor because he was the one who created it. This way, the Church was bigger than the Emperor and became a political force.