 Key texts in Vaishnavism include the Vedas, the Upanishads, the Bhagavad Gita, the Pancaratra (Agama) texts, divya prabhadam eavand the Bhagavata Purana.Vaishnavism originates in the latest centuries BCE and the early centuries CE, with the cult of the heroic Vāsudeva, a leading member of the Vrishni heroes, which was then amalgamated with Krishna, hero of the Yadavas, and still several centuries later with the "divine child" Bala Krishna of the Gopala traditions, followed by a syncretism of these non-Vedic traditions with the Mahabharata canon, thus affiliating itself with Vedism in order to become acceptable to the orthodox establishment.Krishnaism becomes associated with bhakti yoga in the medieval period.