The capital of Tamil Nadu, Madras, was renamed Chennai.

On 18 July 1967, Chief Minister C. N. Annadurai proposed changing Madras State to Tamil Nadu.

The Lok Sabha approved it on November 22, 1968.

The Rajya Sabha approved it on December 18, 1968.

On January 14, 1969, Madras State officially became Tamil Nadu.

The capital city, Madras, was officially renamed Chennai on July 17, 1996.
..