Related by context. Frequent words. (Click for all words.) 59 Roman Empire 53 Papacy 53 Crusades 52 Byzantine Empire 52 Byzantium 52 Roman empire 52 Christendom 51 fifteenth century 51 Soviet Communism 51 Emperor Constantine 50 Byzantines 50 Pax Americana 49 Ottomans 49 Pope Pius IX 48 Justinian 48 Middle Ages 48 Persian Empire 48 thirteenth century 48 Reformation 48 Ancient Rome 47 sixteenth century 47 Caliphate 47 fourteenth century 47 Patriarchal 47 imperium 47 Ottoman empire 46 #BC [001] 46 Pope Leo XIII 46 Protestant Reformation 46 Ottoman Empire 46 Constantinople 46 Holy Roman 46 Benedict XV 46 classical antiquity 45 Otto von Bismarck 45 Enlightenment 45 Romans 45 Roman emperor 45 #AD [001] 44 Dionysius 44 Tacitus 44 Reinhold Niebuhr 44 rulership 44 Hapsburg 44 orthodox Christianity 44 Pope Pius XI 44 Inquisition 44 Caesar Augustus 44 #AD [002] 44 Fascist Italy 43 Nicaea 43 Communism 43 Abyssinia 43 Hellenism 43 Assyria 43 Oliver Cromwell 43 Napoleonic Wars 43 monasticism 43 ecclesiology 43 doctrine 43 Emperor Haile Selassie 43 Ancient Greeks 42 antiquity 42 czarist Russia 42 Pope Innocent 42 Visigoths 42 Paris Commune 42 mankind 42 Totalitarianism 42 persecutions 42 Tsars 42 Carthaginian 42 Papal 42 Dark Ages 42 Franco Prussian War 42 totalitarian regimes 42 Marcus Aurelius 42 Magisterium 42 Babylonia 42 Western Civilization 42 divinely ordained 42 Montesquieu 42 Christianized 42 Clausewitz 42 imperial 42 doctrines 42 caliphate 42 Herodotus 42 Orthodox Churches 42 Islamic Caliphate 41 Colonialism 41 civilization 41 tyrannies 41 despotic rule 41 Hellenistic 41 Soviet empire 41 #BC [002] 41 magisterium 41 Nicea 41 eucharistic 41 seventeenth century