History -- Islam Religious aspects -- 20 Islam -- 13 Caliphs 6 History 5 Economic aspects 4 more ... Economics -- 4 Islamic Empire -- 4 Islam and politics -- 3 Leadership -- 3 Arabs -- 2 Christianity 2 Influence 2 Islam and state -- 2 Relations -- 2 September 11 Terrorist Attacks, 2001 -- 2 Terrorism -- 2 War -- 2 Administrative law (Islamic law) 1 Apostasy -- 1 Auditing -- 1 Autobiography 1 Autobiography -- 1 Buddhism 1 Buddhism -- 1 Business -- 1 Christianity and other religions -- 1 Christians -- 1 Commerce -- 1 less ...