The term caliphate (from the Arabic خلافة or khilāfa, khilafah) refers to the first system of governance established in Islam, and represented the political authority and unity of the Muslim Ummah. It was initially led by Muhammad's disciples as a continuation of the political authority the prophet established, known as the 'Rashidun Caliphate'. It represented the political unity of the Muslim Ummah, not the theological unity as this was a personal matter, and was the world's first major welfare state. A "caliphate" is also a state which implements such a government.Sunni Islam dictates that the head of state, the caliph, should be selected by Shura - elected by Muslims or their representatives. Followers of Shia Islam believe the caliph should be an imam descended in a line from the Ahl al-Bayt. After the Rashidun period until 1924, caliphates, sometimes two at a single time, real and illusory, were ruled by dynasties. The first dynasty was the Umayyad. This was followed by the Abbasid, the Fatimid, and finally the Ottoman Dynasty.
The caliphate was "the core political concept of Sunni Islam, by the consensus of the Muslim majority in the early centuries."
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