legitimacy of Abu Bakr, Umar, and Uthman’s regimes. Instead, they insisted that Ali was Muhammad’s rightful successor: the first imam. This in turn implied an alternative succession, through Hasan and Husayn, then a bloodline of further imams descended from Muhammad. Now this was not solely a dynastic dispute. The Shia framework of Islamic history proposed a significantly different model of organizing the umma, and a different set of leadership values. The Sunni-Shia divide came to be tremendously important during the later Middle Ages, particularly (as we shall see) during the crusading era.
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