Ancient Monuments

History on the Ground

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Trinity Well and Remains of Chapel

A Scheduled Monument in Ilston (Llanddinol), Swansea (Abertawe)

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Latitude: 51.5853 / 51°35'7"N

Longitude: -4.0901 / 4°5'24"W

OS Eastings: 255292

OS Northings: 189454

OS Grid: SS552894

Mapcode National: GBR GV.H36L

Mapcode Global: VH4KF.2F31

Entry Name: Trinity Well and Remains of Chapel

Scheduled Date:

Source: Cadw

Source ID: 3748

Cadw Legacy ID: GM158

Schedule Class: Religious, Ritual and Funerary

Category: Chapel

Period: Medieval

County: Swansea (Abertawe)

Community: Ilston (Llanddinol)

Built-Up Area: Southgate

Traditional County: Glamorgan


The monument comprises the remains of a small chapel dating to the medieval period. Trinity Well Chapel stands in Ilston Combe on the eastern side of the stream. Built by John Myles c. 1649-60, the chapel is the oldest Baptist chapel in Wales. Stones from a pre-reformation chapel dedicated to St Cenydd were used in its construction. The Trinity Well is said to have worked miracles for sore eyes. A memorial stone pier with a plaque commemorating John Myles was added in 1928.

The monument is of national importance for its potential to enhance our knowledge of the organisation and practice of medieval Christianity. The site forms an important element within the wider medieval landscape. The site is well preserved and retains considerable archaeological potential. There is a strong probability of the presence of evidence relating to chronology, layout, building techniques and functional detail.

The scheduled area comprises the remains described and areas around them within which related evidence may be expected to survive.

Source: Cadw

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