The fact of the Caraka Saṁhitā, or the Medical Compendium of Charaka, being a composite work is well known at the present day. The work is the joint production of two medical men, Charaka and Dṛiḍhabala, both natives of Kashmir, and living in that country, probably one in the second, the other in the eighth century of our era. Charaka's share itself claims to be no more than an edition of an earlier work by Agniveśa. This man, being one of the traditional six disciples of Punarvasu, called Ātreya or son of Atri, is said to have reduced to writing the oral teachings of his master, an event which must have occurred at some time in the sixth century before our era. Charaka's edition of Agniveśa's work bears the name of Saṁhitā, or Compendium, while the earlier work of Agniveśa is called a Tantra, or treatise or textbook.