St Cedwyn's Church at Llangedwyn was formerly in the historic county of Denbighshire but since 1996 has been within the Montgomeryshire Shire Area of Powys, Wales. St Cedwyn's was a chapel of ease of Llanrhaeadr-ym-Mochnant. Llangedwyn is 7 miles south-west of Oswestry and to the south of the Berwyn Mountains. Saint Cedwyn may have been a son of the 5th century saint and princess Saint Madryn.