Samuel James Veluppillai Chelvanayakam was a Ceylonese lawyer, politician and Member of Parliament. He was the founder and leader of the Illankai Tamil Arasu Kachchi (ITAK) and Tamil United Liberation Front (TULF) and a political leader of the Ceylon Tamil community for more than two decades. Chelvanayakam has been described as a father figure to Ceylon's Tamils, to whom he was known as "Thanthai Chelva".

Tamil nationalism is the ideology which asserts that the Tamil people constitute a nation and promotes the cultural unity of Tamil people. Tamil nationalism is primarily a secular nationalism, that focus on language and homeland. It expresses itself in the form of linguistic purism, linguistic nationalism, Social equality and Tamil Renaissance.