In Mahabharata

Mahabharata 8.12

When that host was being thus struck and slain by heroic warriors the Parthas, headed by Vrikodara, advanced against us. They consisted of Dhrishtadyumna and Shikhandi and the five sons of Draupadi and the Prabhadrakas, and Satyaki and Chekitana with the Dravida forces, and the Pandyas, the Cholas, and the Keralas, surrounded by a mighty array, all possessed of broad chests, long arms, tall statures, and large eyes.

Mahabharatha 3:88

And, O Yudhishthira, in the country of the Pandyas are the tirthas named Agastya and Varuna! And, O bull among men, there, amongst the Pandavas, is the tirtha called the Kumaris.

Mahabharata 5.19

And similarly, Pandya, who dwelt on the coast-land near the sea, came accompanied by troops of various kinds to Yudhishthira, the king of kings.

Mahabharata 7.23

Steeds that were all of the hue of the Atrusa flower bore a hundred and forty thousand principle car-warriors that followed that Sarangadhwaja, the king of the Pandyas.

If they are mentioned, which means Tamil dynasties existed at that time. However here the author claimed that Cholas didn't exist before some century and has given proof. If they didn't exist, could these verses be an interpolation?

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