south chancel window was designed by H. E. Wooldridge and made by James Powell and Sons; it is dated 1869 and depicts the Nativity, the Resurrection and the Ascension. Associated structures In the churchyard is a Gothic-style pre-Reformation cross. It consists of an oblong shaft standing on a plain pedestal with a sculptured head. On the north and south sides of the head are single niches, and on the east and west sides are double niches. They all have ogee canopies and contain images which are weathered. The cross is listed Grade II* and is a Scheduled Ancient Monument. Also in the churchyard is a sundial dating from the 18th or 19th century. The sundial is in bronze, has retained its gnomon, and stands on a limestone pillar. It is listed at Grade II. On the west side of the churchyard is a building known as Church House. This dates from the 17th century or earlier. It has two storeys, with large openings to the north and south in the ground floor, now walled up. It is likely that this was a hearse house or a lych gate. The upper storey is approached by external stairs, and was originally a parish room or a vestry. It was restored and re-roofed in 1905, and is listed at Grade II. Critique The church is listed by Cadw at Grade I because of its "possessing an exceptionally complete rood screen and loft and otherwise retaining much of its mediaeval character". The architectural historian Edward Hubbard states "the church indeed enjoys the rare good fortune of having a rood screen which retains its loft". Of the churchyard cross, the Royal Commission in 1914 described it as "a monument especially worthy of preservation", and the Cadw listing describes it as "a fine example of late pre-Reformation stonecarving". References External links Artwork at St Mary's Church, Derwen 13th-century church buildings in Wales Grade I listed churches in Denbighshire Derwen English Gothic architecture in Denbighshire Churches preserved by the Friends of Friendless Churches Grade II* listed buildings in Denbighshire Grade II listed buildings in Denbighshire Scheduled monuments in Wales Grade II listed churches in Denbighshire Grade II* listed churches in Denbighshire