On the death of Muhammad in 632, the question of his succession was the origin of the largest division within Islam. The disciples of 'Ali ibn Abi Talib, the Prophet also indicated by the term Shiites, believed that the only ones entitled to exercise power were the Ahl al-Bayt, the "People's House" (the family of the Prophet), and that So Ali, their guide, on the basis of information provided by the Prophet, was the only legitimate successor. They argued that the role of Imam (religious leader) and Caliph (political authority) should be aggregated into a single person, but had to acknowledge as the first Caliph Abu Bakr, who was elected from the community (Umma).
The dispute seemed to compose himself with access to the Caliphate of 'Ali after the violent death of the 3rd Caliph'Uthmān ibn'Affān. (He was, therefore, the fourth Caliph for the Sunnis and the first Imam of the Shiites). But his power was challenged by Muawiyah I, the Umayyad governor of Syria, who rebelled openly
a very explanatory video
Asian Infrastructure Investment Bank
... The Italian commitment to a strong diplomatic action within the United Nations ...
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The Cassini-Huygens mission is a cooperative project of NASA,