This article records tradition as it has been passed down and reported. Its sources are not yet part of the atlas's verified catalogue.
Sathya Sai Baba, born Sathyanarayana Raju in Puttaparthi, Andhra Pradesh, in 1926, began as a teenager to claim he was the reincarnation of an earlier South Indian holy man known as Shirdi Sai Baba, a claim that over more than six decades of public teaching at his ashram in Puttaparthi grew into one of modern India's largest guru movements. The Sathya Sai Organization built on that following eventually claimed millions of followers across dozens of countries, a documented scale reached from a single teenager's claim about his own identity.
His teaching combined Hindu devotionalism with an explicit ethic of service, and the organization he built funded hospitals, schools and water supply projects run under its own name rather than confining its activity to worship and instruction alone. That institutional service work, operating at a scale requiring sustained funding across decades, distinguishes the movement from a purely devotional following organized around its founder's own person.
That a claim of reincarnation made in adolescence produced, within one lifetime, an organization operating hospitals, schools and water infrastructure across dozens of countries marks Sathya Sai Baba's movement as a documented case of a guru's own personal claim translating into an institutional footprint reaching well beyond religious devotion alone.