Final answer:
Charlemagne, crowned Emperor of the Romans by Pope Leo III in 800 AD, attempted to revive the Roman Empire in the 9th century. While his empire did not last, his reign led to the Carolingian Renaissance and had a lasting impact on European history.
Step-by-step explanation:
The individual who attempted to revive the Roman Empire in the 9th century was Charlemagne, also known as Charles the Great. Charlemagne was the King of the Franks and Lombards and was later crowned as the Emperor of the Romans by Pope Leo III on Christmas Day, 800 AD.
While Charlemagne's empire did not last long after his death, his achievements were significant. He managed to unite much of Western and Central Europe under one rule, which had not been accomplished since the ancient Roman Empire. Moreover, he initiated cultural and educational reforms that led to the period known as the Carolingian Renaissance.