According to some scholars, Indian theatre emerged in the 15th century BC. Vedic text such as Rigveda provides evidences of drama plays being enacted during Yajna ceremonies. The dialogues mentioned in the texts range from one person monologue to three person dialogue for instance the dialogue between Indra, Indrani and Vrishakapi. The dialogues are not only religious in their context but also secular for instance one rigvedic monologue is about a gambler whose life is ruined because of it and has estranged his wife and his parents also hate him. Panini in 5th century BC mentions a dramatic text Natasutra written by two Indian dramatists Shilalin and Krishashva. Patanjali also mentions the name of plays which have been lost such as kemsavadha and Balibandha. Sitabenga caves dating back to the 3rd century BC and Khandagiri caves from the 2nd century BC are the earliest examples of theatre architecture in India.