Church of St. Crallo in Coychurch was erected in the 13th century, the first mention of it dates back to 1254. From the Middle Ages to 1877, it did not undergo any major modernizations. Only in the second half of the nineteenth century, renovation was necessary due to the collapse of the tower, which at the time destroyed the southern and partly northern transept. The reconstruction, based on the preserved church illustrations, was carried out by Welsh architect John Prichard.
The church was erected as a three-nave, four-span basilica on a cruciform plan with a rectangular chancel on the eastern side, a northern and southern transept and a tower at the intersection of naves. From the south side, the porch was added to the nave. The windows of the central nave of the clerestorium have the form of a cinquefoil, whereas the windows of the side aisles are crowned with trefoils. The western façade is decorated with a large ogival window with a tracery and a gothic entrance portal. A large gothic window with a tracery also adorns the eastern wall of the chancel.
Wooding J., Yates N., A Guide to the churches and chapels of Wales, Cardiff 2011.
Website britishlistedbuildings.co.uk, Church of St Crallo A Grade I Listed Building in Coychurch Lower (Llangrallo Isaf), Bridgend.