The Caliphate - the state of Islam, which included the areas where the prophets of God lived, about which the Koran tells (Syria, Palestine, Mesopotamia, Egypt, eastern Iran) - was divided into military districts. From the book you will learn everything about Islamic culture, about the Baghdad Caliphate and the Abbasid dynasty, about various trends in Islam: Kharijites, Shiites, Sunnis, etc.