Einhard (also Eginhard or Einhart; Latin: E(g)inhardus; c. 775 – 14 March 840) was a Frankish scholar and courtier. Einhard was a dedicated servant of Charlemagne and his son Louis the Pious; his main work is a biography of Charlemagne, the Vita Karoli Magni, "one of the most precious literary bequests of the early Middle Ages". Source: Wikipedia (en)