Final answer:
Charlemagne believed that Christianity would enhance the unity of his empire by sponsoring Church learning, reorganizing the Church, and reviving education.
Explanation:
Charlemagne, the Frankish King and Holy Roman Emperor, believed that Christianity would strengthen the unity of his empire. He sponsored an increase in learning by the Church to promote moral reform, reorganized the Church, and contributed to the revival of interest in ancient writings and proper Latin. His efforts in reforming Church training and promoting education are known as the 'Carolingian Renaissance.'
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