Tamils constitute 5.9% of the population in India (concentrated mainly in Tamil Nadu and Puducherry), 15% in Sri Lanka (excluding Eelam Moors), 7% in Malaysia, and 5% in Singapore.

From the 4th century BCE, urbanisation and mercantile activity along the western and eastern coasts of Tamilakam what is today Kerala and Tamil Nadu led to the development of four large Tamil empires, the Cheras, Cholas, Pandyas, and Pallavas and a number of smaller states, all of whom were warring amongst themselves for dominance. The Jaffna Kingdom, inhabited by Eelam Tamils, was once one of the strongest kingdoms of Sri Lanka and controlled much of the north of the island.

Tamils were noted for their influence on regional trade throughout the Indian Ocean. Artefacts marking the presence of Roman traders demonstrate that direct trade was active between Ancient Rome and Southern India, and the Pandyas were recorded as having sent at least two embassies directly to the Roman Emperor Augustus in Rome. The Pandyas and Cholas were historically active in Sri Lanka. The Chola dynasty successfully invaded several areas in southeast Asia, including the powerful Srivijaya and the city-state of Kedah. Medieval Tamil guilds and trading organizations like the Ayyavole and Manigramam played an important role in Southeast Asian trading networks. Pallava traders and religious leaders travelled to Southeast Asia and played an important role in the cultural Indianisation of the region. Scripts brought by Tamil traders to Southeast Asia, like the Grantha and Pallava scripts, induced the development of many Southeast Asian scripts such as Khmer, Javanese, Kawi, Baybayin, and Thai. (Full article...)