 He remained in Kufa for an extended period of time and completed his Imamate, which lasted 45 years.He died on 11 th Shawwal 193 AH/27 July 809 AD in the region of Farghana.A letter written in 354/965 by the Fatimid Imam Al-Mu'izz li-Din Allah (d. 365/975) states that, "The da'is used their own names as nick-names for the Imams in order to protect them from persecution; some people were misled by this to such a degree that they said that the descendant of Imam Muhammad bin Ismail was Abdullah bin Maymun al-Qaddah."