Kriya Yoga is a very ancient and effective Yogic science as well as an old age tradition that has been practiced by seers, saints and sages since time immemorial.
In Indian Mythology, eve lord Rama and Lord Krishna practiced and taught the kriya yoga meditation technique. Kriya practices were explained by the rishis in the Upanishadas, by sage Vasishtha in Yoga Vasishtha and by Maharsi Patanjali in his Yoga Sutra.
The Bhagavad Gita (4th Chapter, 1st verse) says that God first reveals the kriya technique to Vivashvan, the Vivashvan passed it to his son Manu, the seventh of the fourteen Manus or progenitors of the human race. Manu then transmitted it to his son Ikshvaku , founder of the first dynasty ok kings in ancient India. From then on this technique was transmitted from father to son, which metaphorically means from master to disciple, through direct oral transmission. Apparently lost in the increasing spiritual decline of later epochs, these teachings were revived by the timeless Mahavatar Babaji Maharaj in 1861, who named the technique "Kriya Yoga".