Bhavaprakasa written by Bhava Misra is a more contemporary authoritative text on Ayurveda and is widely referenced and utilized by students, teachers and physicians of Ayurveda ever since it was written around 1550 AD. Bhava Misra was the son of Lataka Misra and lived in Benares. The Bhavaprakasa is comprehensive, dealing with basic principles, causes, symptoms, and treatment of all diseases. It describes about 500 drugs belonging to vegetable, mineral and animal kingdoms. This wide spectrum of naturally-derived medicinal drugs (Nighantu Bhaga) is considered by many to be the seminal contribution of this text since in incorporates many new drugs unknown--or at least unmentioned--at the time of Charaka and Sushruta.