Short answers, pulled from the story.
Charlemagne was King of the Franks from 768, King of the Lombards from 774, and Emperor of the Carolingian Empire from 800. He united most of Western and Central Europe and was the first recognised emperor to rule from the west after the fall of the Western Roman Empire about three centuries earlier.
Charlemagne was crowned emperor on Christmas Day in the year 800, when Pope Leo III proclaimed him emperor of the Romans and crowned him at mass in St. Peter's Basilica. He was the first reigning emperor in the west since the deposition of Romulus Augustulus in 476.
Charlemagne's year of birth is uncertain but most likely 748, and Lorsch Abbey commemorated the 2nd of April as his date of birth. His place of birth is unknown, with scholars suggesting the Frankish palaces at Vaires-sur-Marne, Quierzy, and Herstal.
The massacre of Verden was an event in which the annals record Charlemagne had 4,500 Saxon prisoners beheaded in 782, after a Frankish army was defeated by the Saxon leader Widukind. The historian Alessandro Barbero calls it perhaps the greatest stain on his reputation.
Charlemagne died on the 28th of January 814 after developing pleurisy and being bedridden for seven days. He was buried at the Palatine Chapel in Aachen, now part of Aachen Cathedral, his imperial capital city.
Charlemagne is called the father of Europe because of the influence of his reign and the legacy he left across a large area of the continent. He is seen as a founding figure by multiple European states, and several historical royal houses of Europe trace their lineage back to him.