One finds that the Tamil Kings have descended from Turvasu ,second son of Yayati.The land alloted to them was what is now Bay of Bengal. This also tallies with Lemuria,the Land of Tamils.
The first king is Simuka.
One of the greatest kings was Gautamiputra Satakarni.
He assisted the Chera King Cheran Senguttuvan.
As Senguttuvan is dated around 9600 BC,Gautamiputra Satakarni and the Satavahavana dynasty may be dated from the present First Century BC to 9600-9500 BC.
Therefore,both Ilango Adigal,Cheran Senguttavan may be anti- dated from the present Third century BC, to 11600 CE.
And the Tsunami of Sangam priod,the Second one,which Silappadikaaram mentions must be earlier to 15,000 years ago.
King Sarangathdwaja wanted to attack Dwaraka to avenge his father's Death, the Pandya King after obtaining weapons from Bhisma, Drona, Balarama and Kripa.
However wiser counsel prevailed and he dropped the idea.
Later he fought alongside the side of the Pandavas against Drona(7:23).
He was rate as an Athiratha by Bhishma( (5,172)
That is, Foreign literature does not quote Puranas/events mentioned by them.
My answer is that my grand father can not quote me.