An Islamic state has a form of government based on sharia. As a term, it has been used to describe various historical polities and theories of governance in the Islamic world. As a translation of the Arabic term dawlah islāmiyyah it refers to a modern notion associated with political Islam (Islamism). Notable historical examples include the first Islamic state in Medina, established by the prophet Muhammad, and the Arab caliphates which continued under his successors, such as the Rashidun and Umayyads.