History 20 Relations 5 Islam 4 Islamic civilization 4 Christianity 3 Christianity and other religions 3 Civilization 3 more ... Historiography 3 Politics and government 3 Civilization, Medieval 2 Crusades 2 History and criticism 2 Interfaith relations 2 International relations 2 Religious aspects 2 15.80 history of Africa 1 18.72 classical Arabic language and literature 1 Aggressiveness 1 Arabisch 1 Church history 1 Climate 1 Climate and civilization 1 Climatic changes 1 Description and travel 1 Domestic relations 1 Early works to 1800 1 East and West in literature 1 Eastern churches 1 Elite (Social sciences) 1 End of the world 1 less ...