Dr. B R Ambedkar studied Buddhism all his life, and around 1950s, Ambedkar turned his attention fully to Buddhism and travelled to Sri Lanka (then Ceylon) to attend a convention of Buddhist scholars and monks. While dedicating a new Buddhist vihara near Pune, Ambedkar announced that he was writing a book on Buddhism, and that as soon as it was finished, he planned to make a formal conversion back to Buddhism. Ambedkar twice visited Burma in 1954; the second time in order to attend the third conference of the World Fellowship of Buddhists in Rangoon.
After meetings with the Sri Lankan Buddhist monk Hammalawa Saddhatissa, Ambedkar organised a formal public ceremony for himself and his supporters in Nagpur on 14 October 1956. Accepting the Three Refuges and Five Precepts from a Buddhist monk in the traditional manner, Ambedkar completed his own conversion, along with his wife. He then proceeded to convert a large number (some 500,000) of his supporters who were gathered around him. He prescribed the 22 Vows for these converts, after the Three Jewels and Five Precepts. He then traveled to Kathmandu in Nepal to attend the Fourth World Buddhist Conference.