In Shi'a Islam, where the Umayyad Caliphs were not recognized, this group of people is considered infalli- ble, starting with the Commander of the Faithful and ending with al-Mahdi, who will return with Jesus.
In Yemen, many people believe that the fifth person to hold this title was Zayd ibn Ali rather than his brother Muhammad al-Baqir, and it used to be common to use this title to denote the leader of Yemen. This title generally takes less importance in Sunni as opposed to Shi'a Islam, but one of its Sunni uses is for the founders of the four madhhabs. In Shi'a Islam, where the Umayyad Caliphs were not recognized, this group of people is considered infalli- ble, starting with the Commander of the Faithful and ending with al-Mahdi, who will return with Jesus. Give this Is- lamic term which can also be used for a prayer leader.
In Yemen, many people believe that the fifth person to hold this title was Zayd ibn Ali rather than his brother Muhammad al-Baqir, and it used to be common to use this title to denote the leader of Yemen.
{Imams}