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The period after the death of the Prophet Muhammad, is extremely important from the aspect of the Islamic history. Some concepts that emerged in this period caused struggles for ages. One of these concepts probably the most important one which is the concept of "Ahl-al-Bayt" is still being discussed almost everywhere even today. Some of the ideological and political formations in the Islamic History exploited this concept. It has been clear that Abbasids identified themselves with Ahl al-Bayt and claimed that political autority belong to themselves. And other formations used "Ahl al-Bayt" as a slogan in the same way.