History -- History 50 Islam -- 35 Islamic Empire -- 20 Caliphs 18 Arabic language -- 12 Islam 12 more ... Criticism -- 9 Religious aspects -- 9 Arabic literature -- 8 History and criticism 8 Civilization 7 Islamic civilization 7 Muslims -- 7 Philosophy 7 Abbasids 6 Arabs -- 6 Biography 6 Doctrines 6 Politics and government 6 Biography -- 5 Caliphate 5 Caliphs -- 5 Politics and government -- 5 Relations -- 5 Study and teaching 5 Sufism -- 5 Umayyad dynasty 5 Caligraphy, Arabic -- 4 Egypt -- 4 less ...