Thaai (Tamil: தாய்) is a 1974 Indian Tamil film, directed by D. Yoganand. The film stars Sivaji Ganesan, Jayalalithaa, Padmini and S. Varalakshmi in lead roles. The film had musical score by M. S. Viswanathan.
A story of two rival kings, played by R. Balasubramaniam and T.E. Krishnamachari, Sivaji Ganesan is the son of the latter. Krishnamachari is under the influence of an ambitious spiritual guru (Nambiar) who manipulates the king for his own ends. The prince works hard to prevent him from achieving his designs. He moves around the kingdom incognito fighting for people’s rights. During this time he meets and falls in love with a dancer (Padmini). The rival king’s daughter Lalitha is also in love with him... The wily advisor (Veerappa) of the other king tries to work out things in his favour and marry the dancer. After many twists and turns, the villains are exposed and the princess sacrifices her love in favour of the dancer.