Key Terms and Identifications Constantine- Emperor of Rome who stopped the persecution of Christians and in 324 made Christianity the official religion of the Roman Empire; in 330 he moved his capital from Rome to Byzantium and renamed it Constantinople Council of NicaeaHeresy- an opinion contrary to the principles of a religion “Power vacuum”Papal States- The temporal dominions belonging to the pope Augustine- one of the great Fathers of the early Christian church; after a dramatic conversion to Christianity he became bishop of Hippo Regius in North Africa; St. Augustine emphasized man's need for grace Jerome- one of the great Fathers of the early Christian Church whose major work was his translation of the Scriptures from Hebrew and Greek into Latin (which became the Vulgate); a saint and Doctor of the Church Elanor of AquitaineAgrarian EconomyBourgeoisie- The social class between the lower and upper classes William of NormandyBattle of Hastings- The decisive battle in which William the Conqueror (duke of Normandy) defeated the Saxons under Harold II (1066) and thus left England open for the Norman Conquest Domesday Book- Record of a British census and land survey in 1085-1086 ordered by William the Conqueror Louis IX- King of France and son of Louis VIII; he led two unsuccessful Crusades; considered an ideal medieval king (1214-1270) Edward I- King of England from 1272 to 1307; conquered Wales (1239-1307) Kievann Rus StateCharlemagne- King of the Franks and Holy Roman Emperor; conqueror of the Lombards and Saxons (742-814)