Holy Trinity Church, Tremeirchion, dates to the fourtenth century, with eighteenth century restoration and the addition of the north transept in the nineteenth century. It is a single chambered church with a medieval arch braced roof and two medieval effigies. In the 1774 Dr Johnson described painted Welsh language texts on the wall, but these are now lost.

Sources include:
CPAT website. 2003.12.22/RCAHMW/SLE
RCAHMW Wallpaintings database. 2004.09.10/RCAHMW/SLE
Arch Camb 1906, 150
Richard Suggett, Painted Temples: Wallpaintings and Rood-screens in Welsh Churches, 1200–1800, (RCAHMW 2021), pp. (cross); 73, 75, 279.

RCAHMW 2022