Answer:
Charlemagne became the ruler of Europe by the sword and the cross.
Step-by-step explanation:
Charlemagne was also known as Charles the great or Charles-I. He is the eldest son of Pepin the short. He became the ruler of western Rome empire over Byzantines’; He united Western Europe for the first time so he is called ‘Father of Europe’.
His empire is called a Carolingian empire which is an extended Frankish empire. He Christianised everyone with the fear of the Death penalty. Feudalism took its birth during his era in Europe.