Abu Abd Allah Mohammed ibn Abdun al-Jabali al-Adadi (Arabic:محمد بن عبدون الجبلي العذري) (died after 976) was a physician and mathematician fromAl-Andalus. He is the author ofRisala fi al-Taksir (Treatise on Measurements), the oldest remaining mathematical text fromAl-Andalus.[1][2] He travelled to the learning centers in the East in the years after 958 C.E. He stayed inBasra and visited al-Fustat (OldCairo), Egypt where he was put in charge of the hospital. Ibn Abdun studied the ideas ofAbu Sulayman Sijistani (d. 990) and according to one source he met him personally in Basra.[3] He returned toCordoba in 971 C.E.. He entered the service of theCaliph al-Mustansir (died 976) and his sonHisham II al-Mu'ayad.[4] Ibn Abdun was the teacher ofIbn al-Kattani.[5]