The chapel dates to January 1839, pre famine times and is of historic significance locally and in County Fermanagh.
Termonamongan Parish Church, otherwise known as St Bestius, was built in 1822, and was extended to accommodate a growing congregation in 1870. The rector from 1850-55, was later to become Bishop and eventually Archbishop William Alexander. His wife was the famous hymn writer Cecil Francis Alexander who penned 'All things bright and beautiful', 'There is a green hill far away' and the Christmas favourite 'Once in Royal David's City'.
The church was substantially renovated in 1977, including new stained glass windows and timber panelling.
Internally, there are several interesting memorial tablets. The pipe organ dates from 1912, and was built in Huddersfield by the famous Conacher company. An octagonal, tulip shaped stone baptismal font dates from 16th century and is said to have been salvaged from an earlier church at Magherakeel, a short distance away. The graveyard also contains some interesting headstones, including a Commonwealth War grave.