Salam. In this article we shall be examining the concept of the twelve Imams (a.s) from the perspective of the so-called 'Ahl ul Sunnah,' using their own academic sources. It is established that both Shi'a Ithna Ashari (twelvers) and Sunnis agree that there will be twelve leaders (a.s) after the Prophet (saw), however, they do not agree on who those twelve are. Read here: http://www.revisitingthesalaf.org/2014/10/imam-al-mahdi-ajf-part-iii_25.html