Church of St Tudor Mynyddislwyn

The Church of St Tudor Mynyddislwyn is a parish church, likely dating from the early 19th century, although incorporating earlier fabric. It comprises a nave, an integral chancel, a south porch, a west tower, and a long north aisle. The church is constructed of narrow sandstone rubble with roughly dressed stone for quoins and dressings, with some ashlar. The roof is a combination of Welsh slate and composite tiles. The nave windows feature a fine set of early 19th-century iron-framed glazing with intersecting tracery.

The three-story west tower is embattled, with small rectangular lights to the tower chambers, smaller to the turret which adjoins the north aisle. It has single, louvred openings with voussoirs to the ringing chamber, and string courses separating the storeys. A small, moulded, pointed arched doorway is located on the west side, along with an Ordnance Survey benchmark on the southwest corner. The north aisle has sprocketed eaves, a square-headed doorway with voussoirs, and two side windows. A two-light window in the northeast and the east chancel window both have Perpendicular style tracery. An elaborately decorated, late Classical painted headstone of a tombchest belonging to Thomas Elias (died 1851) is set against the east wall. The southeast wall is unfinished, and a heavy moulding defines the two-light southeast window. A gabled buttress indicates the division between the nave and chancel, while the nave has three windows; the iron frame in one has been replaced by a late 20th-century stained glass window. The south porch has a plain, pointed arched doorway with narrow voussoirs. Cast metal hoppers are a notable feature.

Inside, the nave is of bare stone, rendered and limewashed to the chancel, with limewashing to the tower. The wagon roof has a boarded ceiling. There is no chancel arch. A four-bay north arcade has octagonal piers on very deep, remodelled broached square plinths, with deeply moulded capitals. The pointed arch in the northwest wall has voussoirs. The tall, pointed tower arch has shallow mouldings on the sides, deeper and recessed to the arch, and a step down to the tower chamber. A narrow tower doorway to the north has a deeply chamfered surround. The northwest bay is boarded off to form a kitchen and vestry, while the northeast bay serves as a chapel. A step up leads to the south door, which is square-headed with a keystone and voussoirs incorporating a six-panelled door. A panelled pulpit against the south wall features a tester, likely a survivor of an 18th- to early 19th-century seating arrangement. A small, possibly early 19th-century font has a painted cover. An 18th-century wall monument is on the northeast chancel wall, and a painted wooden monument from the 18th century is located by the south door, alongside other monuments from the early 19th century and later. Corona light fittings are in the tower and vestry. Plain quarry glazing is used in the iron-framed windows, with stained glass in the east windows, the chancel, and the south window by John Petts in the late 20th century. A display case at the rear of the nave contains Bibles, and some ledger slabs are set into the floor.