Abu 'Abdullah al-Husayn ibn Ahmad ibn Zakariyya al-Shi'i (Arabic: ابو عبد الله الشيعي, Abū 'Abd Allāh ash-Shi'ī) (executed February 28, 911) was a Da'i for the Isma'ilis in Yemen and North Africa mainly among the Kutama Berbers, whose teachings influenced the rise of the Fatimid dynasty. He was born in Kufa in Iraq (or Sanaa, according to some accounts) and was active in the administration of the Abbasid Caliphate, before he began to associate with Ismaili teachers. At first he proselytised under the guidance of Ibn Hawshab in Yemen and Mecca.