If the first migration was from the East, how come there were people already living in these areas?
From where did they come?
For more on this, read my post Rama's ancestor Dravida.
But the Puranas and Tamil Classics provide information that can be checked with astronomical phenomenon, cross checked with other literature, archeological findings.
One such information is the so-called Legends of the Tamil Sangams.
Sangams are Poets' Conclaves held by the Tamil Kings.
There were three such Sangams held.
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