In the Pardoner's Tale, Chaucer mentions part of Avicenna's work concerning poisons.[6] Avicenna's The Canon of Medicine (1025), in Latin translation, was a standard text for medical students up until the 18th century.[7] Roger Bacon, one of the earliest European advocates of the scientific method,[8] is known to have studied the works of several early Muslim philosophers.[9][10] In particular, his work on optics in the 13th century was influenced by the Book of Optics (1021) by Ibn al-Haytham (Alhazen).[11]