1. **Full Name and Titles**: Charlemagne, or Charles the Great, was known as Carolus Magnus in Latin. He was the King of the Franks and later the Emperor of the Romans from 768 until his death in 814.

2. **Reformation and Expansion**: Charlemagne united much of Western Europe through military conquest and diplomatic agreements, creating a vast empire that included modern-day France, parts of Germany, Italy, Spain, and the Low Countries.

3. **Cultural Renaissance**: Under his rule, a cultural and intellectual renaissance took place, often referred to as the Carolingian Renaissance. This period saw renewed interest in classical learning and the establishment of schools and libraries.

4. **Christianization of Europe**: Charlemagne played a significant role in the Christianization of Europe, particularly in the southern parts of his empire. He convened the Council of Frankfurt in 794 and the Council of Aachen in 788, which reinforced Catholic doctrine and centralized religious power.

5. **Legal Reforms**: He implemented the Carolingian Code, a comprehensive collection of laws that standardized legal practices across his realm and had a lasting impact on European legal systems.

6. **Enduring Legacy**: Charlemagne’s legacy includes not only his political and military achievements but also his cultural and intellectual contributions. He is considered a key figure in the transition from the ancient world to the Middle Ages.