This church was designed by Daniel O'Connell, the architect son of the Liberator, for Lt. Col. J.F. Hickie of Slevoir House. The church has been well maintained and retains all its original features, including the pews and carved marble reredos to the interior. Although modest in design the church is built of fine quality materials which include marble and stained glass. The request of the Hickies, that all gravestones to the cemetery be of similar design and equal size, has been carried out to this day. Intact and in excellent condition, Saint Mary's forms an integral part of the village of Terryglass.