Einhard writing Charlemagne's biography

Einhard wrote the "Life of Charles the Great," a biography of Charlemagne. The book was written in Latin and considered a masterpiece due to it's beautiful language. Within the book, there is accounts of Einhard's experiences with Charlemagne as a friend and advisor. The contents cover Charlemagne's achievements as a King and parts of his personal life. The book was popular during the Middle Ages and greatly affected the leaders to come.