Kriya Yoga (क्रिया योग) is described by its practitioners as the ancient Yoga system revived in modern times by Mahavatar Babaji through his disciple Lahiri Mahasaya, c. 1861. Kriya Yoga was brought to international awareness by Paramahansa Yogananda's book Autobiography of a Yogi and through Yogananda's introductions of the practice to the west from 1920.