The monastic settlement at Drumacoo was founded in the 6th century by Sárnait (Sourney, Sairnait, Surney, Sorney), a female saint and associate of Colman mac Duagh. She was buried here at the site known as St. Sourney's Bed.[2]
The original stone parish church had a flat-headed west doorway and was built of large stones.[4] It was extended eastwards in the 13th century AD and the finely-carved south doorway was added.[5]
According to the Annals of Loch Cé, in 1232, "Fachtna Ó hAllgaith, comarb of Druim-mucadha, and official of Uí-Fiachrach; keeper of a house of hospitality for guests and invalids; and the promoter of learning and improver of country and land, in hoc anno quievit." (in this year rested, i.e. died)[6][7]
In 1830, the Gothic Revival mausoleum of the St George family was built onto the stone church.[8][9][10]