The History of the Dharmapuri Diocese is closely connected with that of Salem from where the diocese was bifurcated in 1997. In the year 1623, Christianity came into existence in the Diocese of Salem through the famous Jesuit Fr Robert De Nobili, his successors and later on through the Portugese Jesuits of Madurai Missions. In 1654 the Italian Jesuits of Mysore had their residence at Dharmapuri and began to preach the Gospel in the region as far as Tirupattur in North Arcot district. In 1674, St. John De Britto, visited Dharmapuri on his way to Kolei. He stayed at Dharmapuri with his Confreres, being accompanied by Fr Antony Ribero. In 1687, the Mysore Church work began to spread and preach the Gospel in the present districts of Salem and Dharmapuri. Inspite of the Pombal decree, suppressing the Jesuits, they carried on working under the jurisdiction of Cranganore. In 1711, Fr De. Cunha, a Father was killed by the local people as he was on his horse back towards the Church work place, near Hosur.