History of the Middle Ages By MrsSchappler 476 Fall of the Roman Empire 590 Gregory the Great becomes Pope Important for reforms and institutions like the Gregorian Calendar 622 Muhammad and his followers leave Mecca Important step in establishing Islam Period: 717 to 718 Seige of Constantinople 793 Vikings invade Lindisfarne Begins Viking age and their conquests of England 800 Charlemagne is crowned emperor 1040 Invention of moveable type 1054 The Great Schism
