Abu Mohammed Abdellah Ibn Mohammed Al-Azdi;
(Arabic: ابو محمد عبدالله بن محمد الأزدي) (ca. ? – 1033 CE), known also as Ibn Al-Thahabi, was an Arab physician, famous for writing the first known alphabetical encyclopedia of medicine.
He was born in Suhar, Oman. He moved then into Basra, then to Persia where he studied under Al-Biruni and Ibn Sina. Later he migrated to Jerusalem and finally settled in Valencia, in Al-Andalus (Islamic Spain).