Charlemagne was born in 742 into the royal Frankish family. He became the sole ruler of the Franks in 772 after the death of his brother Carloman. Charlemagne then began expanding his empire through military campaigns, conquering much of central Europe. He was crowned emperor by the pope on Christmas Day in 800. Charlemagne reorganized his government and insisted his subjects convert to Christianity. He also promoted education, founding many schools, and involved himself deeply in the Catholic Church. Charlemagne died in 814 while wintering in Aachen after expanding the Frankish empire to be as large as the Western Roman Empire.