Dating of various tamil text.
Source: The Smile of Murugan: On Tamil Literature of South India By kamil zvelbil
The bulk of tamil literature will fall around 2nd century AD. This date was suggested based on the astronomical computation of the great fire of madurai in 171 AD
Some of the historians like Herman jacobi and B G tilak dated rig veda to 6000 or 4000 BCE.
https://twitter.com/Dharmicgoks/status/1373904318428897284?s=20
The study of Sangam Tamil literature unequivocally states that indo aryan culture was welcome everywhere
in the south and the brahmin ideals were accepted heartily.
https://archive.org/details/K.A.NilakantaSastriBooks/K.%20A.%20Nilakanta%20Sastri/Cultural-Contacts-Between-Aryans-And-Dravidians/page/n71/mode/2up?q=literature
Earliest sangam tamil text clearly mentions about vedic sacrifices performed by kings and chieftains with assistance of brahmins.
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