Dewan > Maharaja

C. P. Ramaswamy Iyer, or Sir CP as he was called, served as the dewan to the maharaja of X from 1936 to 1947. He was instrumental in X's resistance to assimilation in the Indian Union and it was believed that the he had the Maharaja under his thumb. After an attempt on CP's life, X did eventually agree to join independent India. X was joined with another princely state (Y) and a part (Z) of the Madras province of British India to form a new state which united areas that spoke a common language. Identify X. Bonus points for Y and Z.