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Saint Cystennin's church at Llangwstennin
|OS grid reference|
|Sovereign state||United Kingdom|
|Post town||LLANDUDNO JUNCTION|
|Senedd Cymru - Welsh Parliament|
The parish takes its name from St. Cystennin (Constantine) who is said to be a son of St. Helen of Caernarfon (Elen Luyddog) together with whom and with his brother St. Peblig he is credited with introducing into Wales in the 5th century the Celtic form of monasticism from Gaul.