Tamil Nadu which holds in itself a land, a language and a culture existed since the prehistoric times. Human settlement here is said to have existed cotemporary to the civilizations in other parts of world. They existed not as isolated regions of human settlements but was connected through trade. Tamil Nadu was earlier known as Tamilham. The existence of ports such as Arikamedu, Karipattinam, Korkai ware proofs of the Tamilian advancement in establishing relations with other regions of the world. The Tamilians were said to be of Dravidian origin and they originally resided in the north west. With the advancement of the Indo-Aryans the Dravidians were e pushed south. The Sangam literature is the basis of Tamil History, culture and organisations from the 3rd century AD. The Cholas , the Pallavas, the Pandyas and the Cheras had their influence on Tamil Nadu and established their kingdoms.