Jabir ibn Hayyan

Ja'far al-Sadiq (c. 699-765) taught in Medina for some thirty-four years. Descended from Ali and from Abu Bakr, he held to study over revolt, and the Twelver school of law carries his name.

Jabir ibn Hayyan, known in the Latin West as Geber, is the name attached to the founding corpus of Arabic chemical writing, which shaped Islamic science and medieval alchemy. Tradition places him at the early Abbasid court; modern scholarship dates the corpus later and doubts a single author.