History -- 147 History 129 Caliphs 34 Islam -- 27 Islamic civilization 16 Politics and government 16 Arabs -- 14 more ... Islam 14 Abbasids 12 Umayyad dynasty 12 Biography 11 Intellectual life 10 Historiography 8 Islam and state 8 Caliphate 7 Crusades 7 History, Military 7 Kings and rulers 7 Religious aspects -- 5 World history 5 Biography -- 4 Civilization, Arab 4 Description and travel 4 Genealogy 4 Islamic civilization -- 4 Missions -- 4 Muslims -- 4 Political science -- 4 Caliphs -- 3 Chronology 3 less ...