It is a striking intrusion into what is otherwise a quiet rural graveyard, the kind of structure that makes clear, without any inscription being needed, that the family buried here considered themselves a category apart from their neighbours.

The mausoleum was built in 1830 for Lady Harriet St George and her husband Arthur F. St George, members of a landed family whose presence in this part of Connacht left a visible mark on the landscape. The structure extends from the church at Drumacoo, and the family's claim on the site did not stop there. A section of the surrounding graveyard to the west of the mausoleum was also enclosed separately, reserving a further portion of consecrated ground exclusively for St George burials. The effect is of a family arranging the dead with the same proprietary confidence they would have applied to their estates among the living.