Answer:
true
Step-by-step explanation:
According to some online sources, Charlemagne was a king of the Franks who ruled from 768 to 814 CE. He expanded his kingdom through conquest and diplomacy, and united most of Western Europe under his rule. He created the Carolingian Empire, which was named after his grandfather Charles Martel. He also promoted culture, education, and religion in his empire, and was crowned as the first Holy Roman Emperor by Pope Leo III in 800 CE. Therefore, it is true that Charlemagne built the Carolingian Empire.