The Diocese of Bangalore was formerly part of the Mysore Mission erected into a Vicariate in 1850, after separation from Pondicherry in 1886, when the Hierarchy in India was established by the Bull "Humanae Salutis Auctor". Mysore became a diocese with Bangalore as headquarters. This diocese was bifurcated and thus the Diocese of Bangalore as such was erected on February 13, 1940. It became an Archdiocese on September 19, 1953. On November 14, 1988 the Diocese of Shimoga was created to which Bangalore Archdiocese ceded the civil district of Chitradurga. Thus the actual Bangalore Archdiocese comprises only three civil districts of Bangalore, Kolar and Tumkur.