Who was Charlemagne and what 4 things did he do to strengthen his kingdom?

Charlemagne, also known as Charles the Great, was the King of the Franks and Lombards and later became the Emperor of the Carolingian Empire, ruling from 768 to 814. To strengthen his kingdom, he expanded his territory through military conquests, established a centralized administration by appointing local officials called counts, promoted education and cultural revival through the Carolingian Renaissance, and forged alliances with the Church, notably being crowned Emperor by Pope Leo III in 800, which helped legitimize his rule.