This church ruin is said to have been erected by St Patrick. Called Teampall na bhFiachal, or ‘the Church of the Teeth’, it gets its name from a line of rocks resembling teeth, visible from the church. The remains of the church reveal that the church was built after the arrival of St Patrick.
Local legend says, however, that the church was built on the site of a smaller structure, local folklore also says the bell from the original structure lies under the surrounding bog.
The founder of the church is said to be St Senach, the Bishop of Aughagower who lived in the 7th Century CE.