The church dates from the 13th or 14th century, in the Early English and Perpendicular styles, with some 16th-century features. It was heavily restored in the 1870s. The dedication is to St. Catwg or Cadoc, a Welsh saint of the 6th century. There are porches on both the south and north sides, supposedly so that the squires of Cwmbychan and Trevildu within the parish did not have to enter through the same door as each other.