The church in Llanddetty was probably erected in the 13th century. In its interior was found a pillar stone from the ninth century, and although its original location can not be determined with certainty, the call of the name of the early Christian saint, location on the river and morphology of the churchyard cemetery, indicate the beginnings of the temple in the early Middle Ages. In 1878, the building underwent a thorough renovation, and in 1934 the roof was replaced.
The church is a simple and small, aisleless building on a rectangular plan, without an externally separated chancel. It was erected from dark red sandstone. On the south side there is a porch. The bellcote on the west side is an early modern addition, and the windows have been transformed in a later period.
Website cpat.demon.co.uk, Church of St Tetti , Llanddetty.
Website parish.churchinwales.org.uk, St Tetti, Llanddetty.