History -- 71 Islamic Empire -- 16 History 15 Caliphs 13 Islam 7 Caliphs -- 6 Islam -- 6 more ... Biography 5 Caliphate 4 Religious aspects -- 4 Politics and government 3 Biography -- 2 Historiography -- 2 Islam and politics -- 2 Leadership -- 2 Muslim women -- 2 Riddah Wars 2 Siffin, Battle of, Syria, 657 2 War -- 2 Abbasids 1 Apostasy -- 1 Arabs -- 1 Caliphate -- 1 Camel, Battle of the, Iraq, 656 1 Circassians -- 1 Conduct of life 1 Economic consitions 1 History, Military 1 Imams (Shiites) 1 Industries -- 1 less ...