Vangal Krishnamachari Thiruvenkatachari (30 January 1904 â 23 January 1984) was an Indian lawyer who served as the Advocate-General of Madras State from 1951 to 1964. He was the eldest son of Indian civil servant Sir V. T. Krishnamachari. A letter written by Vangal Krishnamachari Thiruvenkatachari became the foundation of Ninth Schedule to the Constitution of India.ò