A Neolithic stone celt (a hand-held axe) with the Indus script on it was discovered at Sembian-Kandiyur near Mayiladuthurai in Tamil Nadu.
According to epigraphist Iravatham Mahadevan, this was the first datable artefact bearing the Indus script to be found in Tamil Nadu.
The evidence emerged a few years ago after a group of Aboriginal men’s Y chromosomes matched with Y chromosomes typically found in Indian men.
The study found a pattern of SNPs that is found in genetics of Dravidian speakers from South India.
All three dynasties had extensive trade relationships with Rome, Greece, Egypt, Ceylon, Phoenicia, Arabia, Mesopotamia and Persia.
Trade flourished in commodities such as spices, ivory, pearls, beads and gems.
Mahadevan claimed that the find was evidence of the use of the Harappan language, and therefore that the "Neolithic people of the Tamil country spoke a Tamil language".
The date of the celt was estimated at between 1500 BCE and 2000 BCE.
Devi will battle it out against none other than AIADMK supremo Jayalalithaa in the RK Nagar constituency in Chennai.
The recent excavations in Alagankulam archaeological site suggests that Alagankulam is one of the important trade centre or port city in Sangam Era.
Three dynasties, namely the Chera, Chola and Pandya, ruled the area of present-day Tamil Nadu and Kerala.
Chera traded extensively from Muziris on the west coast, Chola from Arikamedu and Puhar and Pandya through Korkai port.
A Greco-Roman trade and travel document, the Periplus of the Erythraean Sea (c.