He is well known as an author, teacher (Alcuin was a student of one of his pupils), and scholar, and his most famous work, "Ecclesiastical History of the English People", gained him the title "The Father of English History". His ecumenical writings were extensive and included a number of Biblical commentaries and other theological works of exegetical erudition. Another important area of study for Bede was the academic discipline of "computus", otherwise known to his contemporaries as the science of calculating calendar dates. One of the more important dates Bede tried to compute was Easter, an effort that was mired in controversy. He also helped popularize the practice of dating forward from the birth of Christ ("Anno Domini" – in the year of our Lord), a practice which eventually became commonplace in medieval Europe. Bede was one of the greatest teachers and writers of the Early Middle Ages and is considered by many historians to be the most important scholar of antiquity for the period between the death of Pope Gregory I in 604 and the coronation of Charlemagne in 800.