With the fall of the
Guptas, Bhagavatism had lost its pre-eminence in the north, with
Vardhana sovereigns such as
Harsha adhering to non-Bhagavata creeds. Though the Bhagavata religion still flourished in the north, its stronghold was now not the valley of the Ganges or Central India, but the Tamil country. There, the faith flourished under the strong impetus given by the
Alvars, "who by their Tamil songs inculcated Bhakti and Krishna-worship mainly". Bhagavatism had penetrated into the Deccan at least as early as the first century BCE. The
Cilappatikaram and the other ancient Tamil poems refer to temples dedicated to Krishna and his brother at Madura, Kaviripaddinam, and other cities. The wide prevalence of Bhagavatism in the far south is also testified to by the
Bhagavata Purana which says that in the Kali Age, devoted worshippers of Narayana, though rare in some places, are to be found in large numbers in the Dravida country watered by the rivers Tamraparni, Kritamala, Kaveri, and the great stream (Periyar) flowing to the west. Yamunacharya, who laid the tenets of the
Vishishtadvaita philosophy, has his works described as "a somewhat modified and methodical form of the ancient Bhagavata, Pancharatra, or Satvata religion". The Alvars would be among the first catalysts of the
Bhakti movement, a Hindu revivalist movement that would reintroduce Bhagavata philosophy back to its place of origin. ==Literary references==