The church of the Three Saints: St. Illtyd, St. Gwynno and St. Dyfodwg, was built in the 13th century on the site of an earlier temple from the 7th-9th centuries. The first mention about it appeared in 1254. In the fifteenth century, a tower was added, and in the seventeenth a southern porch was built or rebuilt. In the second half of the nineteenth century, the church underwent a major renovation combined with reconstruction, including the northern porch and sacristy.
The medieval church consisted of a wide, three-nave corpus in hall structure, a much narrower, rectangular chancel, a tower on the west side and a porch on the south side. The tower has four-stepped corner buttresses ending in pinnacles, the crenellation finial and a multi-sided communication tower on the north-east side. The temple’s block has buttresses and five spans with alternating circular and polygonal pillars. The chancel is ended with a straight wall without buttresses. Inside the church, attention is drawn to the 13th-century tombstone of the knight Cadwgan Fawr from Miskin and the 15th-century octagonal baptismal font.
Website britishlistedbuildings.co.uk, Church of St Illtyd, St Gwynno and St Dyfodwg A Grade II Listed Building in Llantrisant, Rhondda Cynon Taff.
Website wikipedia.org, Llantrisant Church.