This is the latest in the LSHTM Rare Books Blog, featuring Rhazes (full-name: Muhammad ibn Zakariyā al-Rāzī). Rhazes made notable contributions to many areas of medicine. His manuscripts, carefully preserved down the centuries, were among the first medical books printed in Europe in the 15th century. After translation into Latin Rhazes’s writings became widely disseminated and were to influence the future direction of western medicine.