Abu Yaqub Sijistani

Abu Ya'qub Ishaq ibn Ahmad al-Sijistani, also known as al-Sijzi or Bandaneh, was a 10th-century Persian Ismaili missionary active in the northern and eastern Iranian lands. His life is obscure, but he was a prolific writer, who played a crucial role in the infusion of Neoplatonic ideas into Ismaili theology. He died in 971, likely executed by the Saffarid emir of Sijistan. His works include Kashf al-mahjub, Ithbat al-nubu'at, Kitab al-iftikhar, Al-Yanabi, Al-Maqalid, Al-Nusra, and Sullam al-najat, as well as various epistles.