Church of St Mellon

Interior is unrendered rubble with ashlar dressings. Wagon roofs. Nave has 2- bay S arcade of 2-ordered pointed arches with stepped capitals, one bay occupied by organ, and a further blocked bay to tower. Blocked N door. Some early bench seating with simplified cusped poppy-heads. Font is small, hexagonal and roughly chalice-shaped with blind tracery panels to stem. Panelled vestry created adjacent. Pointed roodloft entrance doorway NE with square-headed former access doorway above. Unusual wide pointed chancel arch with the mouldings sweeping out to the stepped capital and narrower arch sharing the same pier to N chapel, C19 stone pulpit in front; window in nave apex; wooden chancel screen in late medieval style probably early C20. Chancel has squint from N chapel which contains early C19 monument to David Richards of Llanrumney Hall and an asymmetric arch to S chapel which has an altar at E; above in E wall is a niche with finely wrought foliage corbel, no canopy; sill appears to incorporate piscina. C18 and C19 wall tablets in chancel, one to members of the David family of St Julian's farm. E window of 1882 believed to be by Clayton and Bell. Enriched wallplate, shaped ends to the ribs of the wagon roof. Six bells in tower originally from Chepstow foundry 1713 recast 1913.

Medieval church. Long nave with S porch and S tower, unusually close together, S chapel, narrow chancel, N chapel. Of rubble variously hued with ashlar dressings, slate roofs, some pitches of small slates, with cruciform apex finials; all walls are battered, most strongly the tower and E chancel wall. W end of nave has 3-light window with reticulated tracery, hoodmould with foliage stops and a stone head above apex, low pointed-arched W doorway set within an altered opening with relieving arch above; elaborate iron hinges to boarded door. At SW nave is a 3-light window with Perpendicular tracery; all such windows here have deep almost Tudor-arched hoodmoulds. Immediately adjacent and part overlapping is a deep gabled S porch, with remnants of render, moulded doorway with hoodmould, the stops slightly swept out. Porch interior has wooden barrel roof, the 3 principal ribs supported by stone corbels, stone benches, holy water stoup to right of inner moulded doorway. Immediately to E and separated only by a drainage channel, is the 4-storey church tower, without buttresses, embattled parapet, 2 string courses; paired cusped louvred lights under relieving arches to belfry and small single light rectangular-headed openings at 2 levels; former ground floor pointed-arched doorway blocked but incorporating a 3-light window. Abutting the tower is the S chapel with three 3-light Perpendicular windows and a narrow priests' doorway with stone head above; stone bench at SE with inscription 1796 below commemorating Evan Phillips who erected it. 3-light E window with reticulated tracery and foliage stops to hoodmould. Chancel has similar but larger 3-light E window and small SE window of 2 trefoil-headed lights within ogees. N chapel has large rectangular 3-light E window with chamfered surround and mullion under a rough relieving arch, large stone brackets at eaves for gutters; 3-light Perpendicular N window and narrow doorway. N nave has 3 similar Perpendicular windows, the hoodmoulds almost overlapping the eaves, shallow bay at E end for roodloft stairs, wide blocked N doorway with narrow stone voussoirs.