Diocesan organisation was instituted in 1111 AD by the Synod of Ráth Breasail.

It was the site of a monastery founded early in the 6th century by Saint Luchtigern.

[2] During the chaotic period that followed the "Glorious Revolution" of 1688, two priests served the area, one in Kilnasoolagh and Tuamfinlough, and the other in the five parishes of Bunratty, Drumline, Clonloghan, Kilconry and Kilmaleery.

The penal laws were eased that year, but due to the shortage of priests, the consolidated structure was retained.

Three churches replaced the original seven, sited within walking distance of the congregations.