Crusades History 199 Church history 40 Christianity 22 Christianity and other religions 22 Islam 20 Middle Ages 20 more ... Relations 19 Historiography 18 Religious aspects 18 Influence 15 Civilization, Medieval 13 Ethnic relations 10 Jews 10 Social conditions 10 War 10 History of doctrines 9 Kings and rulers 9 Persecutions 9 Sources 9 Crusades in literature 8 History, Military 8 Normans 8 History and criticism 7 Croisades 6 Franks 6 Interfaith relations 6 Military history, Medieval 6 Papacy 6 International relations 5 less ...