Ibn Khordadbeh
Abu'l-Qasim Ubaydallah ibn Abdallah ibn Khordadbeh (Arabic: ابوالقاسم عبیدالله ابن خرداذبه; 820/825–913), commonly known as Ibn Khordadbeh (also spelled Ibn Khurradadhbih; ابن خرددة), was a high-ranking bureaucrat and geographer of Persian descent[1] in the Abbasid Caliphate.[2] He is the author of the earliest surviving Arabic book of administrative geography.[3]