What important actions did Charlemagne undertake to reunite Europe?

Charlemagne undertook several key actions to reunite Europe, notably through military conquests that expanded his Frankish kingdom, effectively uniting various tribes and regions under his rule. He implemented administrative reforms, establishing a network of local leaders called counts to maintain control and governance over his vast territories. Additionally, he promoted the spread of Christianity, aligning the church with his authority, which helped to unify the population culturally and religiously. His crowning as Emperor of the Romans by Pope Leo III in 800 AD symbolized the fusion of Roman, Christian, and Germanic elements, reinforcing his role as a unifying figure in medieval Europe.