---
title: "St Mary, Llanywern"
description: "Located in Llanywern, Powys. Built 14th century; windows probably 17th century. Diocese of Swansea and Brecon. Grade II*. Medieval style."
category: "Church"
tags: ["Church","Church in Wales","Powys","Llanywern","Grade II*","Medieval"]
canonical: "https://thebritishgazette.com/post/st-mary-llanywern"
pubDate: "2026-09-06T02:10:29.180Z"
dateModified: "2026-09-07T14:53:51.333Z"
location: "Llanywern, Powys"
country: "Wales"
county: "Powys"
town: "Llanywern"
address: "Llanywern, Powys, NP18 2DN"
postcode: "NP18 2DN"
built: "14th century; windows probably 17th century"
denomination: "Church in Wales"
dedications: ["Mary"]
diocese: "Swansea and Brecon"
grade: "II*"
style: "Medieval"
materials: "Stone rubble, banded Welsh slate roof"
website: "https://parish.churchinwales.org.uk/s451/churches-en/st-mary-llanywern_-en/"
openingHours: "The church is always open and has easy access."
parish: "Llan-y-wern"
listEntryUrl: "https://cadwpublic-api.azurewebsites.net/reports/listedbuilding/FullReport?lang=en&id=6770"
gridReference: "SO 101 286"
accessNotes: "Level access to the main areas"
---

# St Mary, Llanywern

St Mary’s Church at Llan-y-wern, in the community of Llangors, Powys, is a Grade II* medieval church little restored in the nineteenth century, in the Diocese of Swansea and Brecon.

## Overview

Cadw records an Early Christian site dedicated to St Cynidr. The dedication changed to St Mary when the church became a chapel of ease to St John’s Priory, Brecon, in the fourteenth century. Existing masonry is not easily dated; *Buildings of Wales* treats it as fourteenth century, with windows probably of the seventeenth century and a post-medieval porch. The building is a simple low rectangle of stone rubble under a banded Welsh slate roof, with a large west porch, a small west bellcote, and two deep full-height buttresses on the north nave wall.

The interior escaped Victorian restoration. A scissor-braced nave has a five-sided wagon roof; the chancel retains a late-medieval boarded ceiling with reeded ribs and traces of red paint on the rood beams. Wainscot behind the altar is dated 1657. The font is a plain bowl with a short stem. Cadw lists the church II* as a scarce unrestored small medieval church, with group value with Ty Mawr and Ty Canol. The church is lit by oil lamps.

## Further Information

- [Cadw listed building 6770](https://cadwpublic-api.azurewebsites.net/reports/listedbuilding/FullReport?lang=en&id=6770)
- [Church in Wales: St Mary, Llanywern](https://parish.churchinwales.org.uk/s451/churches-en/st-mary-llanywern_-en/)
- [Coflein NPRN 405964](https://coflein.gov.uk/en/site/405964/)