Maharishi Data Dayal Shiv Brat Lal Ministry: 1898 to 1939 [Most likely did not begin his guru ministry, however, until the beginning of the 20th century] Guru: Rai Salig Ram Successors: Faqir Chand; Nandhu Singh; and Sheri-Boa Dutt (Pir Munga) Center: Lahore; Gopiganj Distinctions: Perhaps the most prolific author in the history of Radhasoami; estimated to have authored over 3,000 books and pamphlets. Sources: Light on Ananda Yoga; Dayal Yoga; and Shabd Yoga.