Abu Hatim Ahmad ibn Hamdan al-Razi
Abū Ḥātim Aḥmad ibn Ḥamdān al-Rāzī (Persian: ابو حاتم احمد بن حمدان الرازی) was a Persian Ismaili philosopher of the 10th century, who died in 322 AH (932/933 CE). He was also the Da'i al-du'at (chief missionary) of Ray and the leader of the Ismaili da'wah in Central Persia.
Source: Wikipedia — Abu Hatim Ahmad ibn Hamdan al-Razi (CC BY-SA 4.0)