Prabhat Ranjan Sarkar (21 May 1921 – 21 October 1990) (Bengali: শ্রী প্রভাত রঞ্জন সরকার), also known by his spiritual name, Shrii Shrii Ánandamúrti (Ánanda Múrti="Bliss Embodiment"), and known as Bábá ("Father") to his disciples, was an Indian philosopher, yogi, author, social revolutionary, poet, composer, and linguist.