Global I Chapter 7A Key Terms Origins of the Byzantine Empire, Constantinople, Strategic location Autocrat, Patriarch, Justinian, Theodora Justinian’s Code, Haga Sophia, Icon, Schism, Differences between the Roman Catholic Church and the Byzantine Church Collapse of the Byzantine Empire Causes of the Dark Ages The Magyars, the Vikings, the Franks, Clovis, Battle of Tours Charlemagne (his accomplishments, his relationship with the Church), Holy Roman Empire Alcuin, missi dominici, palace school, Treaty of Verdun Feudalism, fief, vassals, knights, chivalry, serfs, manor High Middle Ages, 3-field system,. Bourgeoisie, guilds, Hanseatic League Reasons for the Crusades, Saladin, Results of the Crusades, Reconquista,