The khalifa system
The term khalifa, "dominion of ('successor') refers to the first system of government established in Islam and represented the leaders unity of the Muslim Ummah (community
In theory, it is an aristocratic–constitutional republic
(the Constitution being the Constitution of Medina), which means that the head of state, the khalifa, and other officials are representatives of the people and of Islam and must govern according to constitutional and religious law, or Sharia. In its early days