Why was Charlemagne called the Father of Europe and Roman Empire?

Charlemagne, crowned Emperor of the Romans in 800 AD, earned the title "Father of Europe" for his role in uniting much of Western Europe under a centralized Christian authority. His reign marked the Carolingian Renaissance, promoting cultural and educational revival, which laid the groundwork for the future development of European nations. By reviving the concept of the Roman Empire in the West, he established a legacy of governance that influenced the political landscape of Europe for centuries. His efforts in unifying diverse territories fostered a sense of shared identity among the peoples of Europe.