Prarthana Samaj, or "Prayer Society" in Sanskrit, was a movement for religious and social reform in Bombay based on earlier reform movements. Prarthana Samaj was founded by Atmaram Panduranga(with the help of Keshav Chandra Sen) in 1867 with an aim to make people believe in one God and worship only one God. It became popular after Mahadev Govind Ranade joined. The main reformers were the intellectuals who advocate reforms of the social system of the Hindus.