Charlemagne

Charlemagne was born as Carolus Magnus on April 2, 742, in Aachen. Pepin the Short, Charlemagne's father, dethroned the final Merovingian king and was crowned by Pope Stephen ll. Aistulf attacked the city of Rome, and Charlemagne's father went to save the Pope, and Charlemagne accompanied him. When Pepin died, he left his kingdom to Charlemagne and his brother Carloman. Once Carloman died, there was no proof that Charlemagne had anything to do with the death of him. Pope pleaded for help, and Charlemagne conquered his father-in-law's land, confirming to keep Papal safe. King Charlemagne, leader of the Franks, attacked Saxony and Widukind, their leaders.  When Charlemagne's rear guard left Spain, many events took place, in which they have to do with the defeat of Roland. This is the most important epic of all in the Middle Ages. 
Charlemagne finished attacking Saxony, and enforced strict rules for them to follow. Pope Hadrian had died that day, and Pope Leo III was crowned the new pope. Pope Leo was attacked in Rome on religious duties, but when he came back to Charlemagne, the Great King sent him back to Rome. Charlemagne called a trial for Pope Leo III in Rome, and the Romans could not find him innocent or guilty. After Charles the Great majorly helped Pop Leo III, he was crowned holy emperor. In 813, Charlemagne gave the crown to his surviving son, Louis. The year following, Charlemagne died on January 28. Charlemagne was important in the Middle Ages, because he saved the Pope, and was crowned holy emperor.