 However, at this point the Ismāʿīlī Imāms according to the Nizari and Musta'li found areas where they would be able to be safe from the recently founded Abbasid Caliphate, which had defeated and seized control from the Umayyads in 750 CE.During the period of Ja'far, the Abbasid Caliphate replaced the Umayyads and began to aggressively oppose belief in an Imamate.Due to strong suppression by the Abbasids, the seventh Ismāʿīlī Imam, Muhammad ibn Ismail, went into a period of occultation.