In 1948, Fr.Mark Gopu was ordained Auxiliary Bishop to Archbishop Colas. When Rome transferred him to the Archdiocese of Hyderabad in January 1953, Fr.Ambrose of Coimbatore, who was a Professor at St.Peter’s Seminary, Bangalore, was nominated Auxiliary Bishop of Pondicherry . He was later made into coadjutor Bishop.
As the Archdiocese of Pondicherry extended over the Pondicherry Union Territory and the South Arcot District of Tamilnadu State, it was given a new title or name by Rome: “Archdiocese of Pondicherry and Cuddalore” on 07-08-1953.