It owes its early history to Father Daniel Murphy along with Bishop Carew.

The church began with the work of Daniel Murphy among Irish Catholics in the British Army.

[2] He arrived in India in 1839, and began the construction of St. Mary's church as a cathedral in 1840.

[3] The church is a typical example of the Indian Gothic style, with curved arches and pointed buttresses.

As with other Catholic churches, St. Mary's has several side altars dedicated to saints.