Kitāb al-Kīmyāʼ (Arabic: كتاب الكيمياء) is a writing on alchemy by Jābir ibn Hayyān, written sometime in the late 8th century. Originally written in Arabic, it was translated into Latin and various European languages. It was translated in 1144 by Robert of Chester as The Book of the Composition of Alchemy. It was the most influential of Jābir ibn Hayyān’s books in the West. The book, along with his Kitab al-Sab’een, has been described as being “popular in Europe for several centuries” and influencing the evolution of chemistry.