Bharatanatyashastra is an ancient Indian treatise on drama, dance and music of Bharatvarsha, that is, India. The treatise is believed to be written between 100 and 300 by a sage named Bharata (not to be confused with king Bharata). Bharata is credited with codifying the theory of Indian dance and drama, and is regards as the first such critic of the Indian subcontinent. His encyclopedic treatise expands on poetics, drama, dance, music, and elements of aesthetics.