
On 3rd April, 1845 : Coimbatore was announced and established as a new diocese, which was part of Pondicherry diocese till then.
First Bishop : Bishop Marion de Bresillac.
24th July,1849 : Bishop Marion de Bresillac decided to erect a new cathedral for the diocese.
15th Aug, 1850 : Bp.Bresillac along with Bp.Paasi Nelli decided the blueprint of the new cathedral.
1850 : Bp.Bresillac laid the foundation stone (took 17 years to complete the construction work)
28th April,1867 : Bp.Thepomeo consecrated the cathedral.
Sep,1873 : Bp.Thepomeo died and his body was buried in the cathedral.
23rd Aug,1874 : Bp.Joseph Bardou was the new bishop of the diocese
7th Feb, 1903 : Bp.Joseph Bardou died.
1903 : Fr.Dennis Peiramal was chosen as the Bishop.
17th Aug, 1903 : Bp.Dennis Peiramal died.
Fr.Rondy was the incharge of the cathedral till the new bishop was ed.
28th Dec,1903 : Bp.Augustin Roy was chosen as the bishop.
12th Feb,1904 : Bp.Augustin Roy was consecrated as bishop.
12th Jan.1931 : Bp.Augustin Roy resigned his episcopacy.
21st Dec,1937 : Bp.Augustin Roy died.
25th May,1987 : Bp.Augustin Roy's body remains were buried in the cathedral.
1940 : Bp.Oubagarasamy was the first Indian bishop.
1947 : centenary year of the diocese.
26th April,1950 : Bp.Francis Savarimuthu.
1954 : His Eminence.Cardinal Valerian Gracias visited the diocese for the first time.