The major source of evidence for Sanskrit theatre is "A Treatise on Theatre" ("Nātyaśāstra"), a compendium whose date of composition is uncertain (estimates range from 200 BCE to 200 CE) and whose authorship is attributed to Bharata Muni. The "Treatise" is the most complete work of dramaturgy in the ancient world. It addresses acting, dance, music, dramatic construction, architecture, costuming, make-up, props, the organisation of companies, the audience, competitions, and offers a mythological account of the origin of theatre. In doing so, it provides indications about the nature of actual theatrical practices. Sanskrit theatre was performed on sacred ground by priests who had been trained in the necessary skills (dance, music, and recitation) in a process. Its aim was both to educate and to entertain. Characters in Sanskrit plays were important. They were broadly classified into three kinds which are Nayaka(hero), Nayika(heroine) and the Vidusaka(Clown).