How did Charlemagne help to spread the religion of Christianity?

Charlemagne played a crucial role in spreading Christianity through his military conquests and diplomatic efforts, often forcing the conversion of conquered peoples. He established the Carolingian Empire, which promoted the integration of Christian practices into governance and society. Additionally, he supported the establishment of monasteries and churches, which helped to educate the populace and reinforce Christian values. His close relationship with the Pope also strengthened the Church's influence across Europe.