1969 boundary change
In 1969, in an effort to bring the diocesan boundaries in line with civil districts, the Taluk of Tiruthani in the District of Chingleput, belonging to the Diocese of Vellore, was detached from it and added to the Archdiocese of Madras–Mylapore. In addition, the Taluks of Thiruvannamalai and Chengam in the District of North Arcot, up to then belonging to the Archdiocese of Pondicherry-Cuddalore, were detached from it and added to the Diocese of Vellore.Decree Prot. No.404/69 1 September 1969 of the Sacred Congregation for the Evangelization of Peoples)Career as Bishop
On March 6, 1971, Muthu was nominated as the Bishop of Vellore. He was consecrated bishop on April 21, 1971. He established 24 convents in the Diocese of Vellore. He established Perpetual Adoration Monastery of Sisters of Poor Clare at Rangapuram, Sathuvachary. He also erected 17 new parishes. He also saw to the needs of the retired priests in getting a house constructed at Sathuvachary, Vellore. A Mother and Child welfare programme was organized with the help of1975 boundary change
During Muthu's period as Bishop, by a decision dated 20 January 1975, of the Sacred Congregation for the Evangelization of Peoples, the five taluks of the civil district of Chittoor, namely Chittoor, Palmaner, Kuppam, Bangaupalam and Satyavedu belonging to the Diocese of Vellore were detached from it and added to the Diocese of Nellore, Andhra Pradesh. Muthu died on December 19, 1980.References
{{DEFAULTSORT:Muthu, Royappan Antony 1912 births 1980 deaths 20th-century Roman Catholic bishops in India