Next to the church lie the remains of an Iron Age hut circle, and some stories romantically suggest that this was where St. Celynin himself lived.
The church is overlooked from the north-east by the adjacent crags of Cerrig-y-ddinas, the site of an Iron Age hillfort.
Many old paths lie in the area, and these routes would have been established at a time when the hills were considerably more wooded.
To the south-west a path meets the important Neolithic route and Roman Road passing through Bwlch-y-Ddeufaen, which connected the Conwy valley to the north coast near Llanfairfechan, and places further westwards.
Repairs to the porch roof were made using yew wood, and therefore it is quite possible that these came from the churchyard, which at one time contained trees.
This was called Capel Eirianws (meaning "Plum Orchard", the name of a local farm), whose owner possibly had it built.
This later renovation work was carried out under the guidance of Gerald Speechley, and a plaque in the church records this.
The remains of the rood screen in front of the more recent lectern date from the 14th century, and would have separated the nave from the chancel.
[4] One bench (at the front of the north chapel) still bears the initials R.O.B., this being the Reverend Owen Bulkeley, a former rector, who died in 1737.
Just inside the church, on the wall, is a holy water stoup, used until the 19th century for making the sign of the Cross.
In the south-eastern corner of the churchyard is a well, Ffynnon Gelynin (sometimes known as "The Holy Well of St. Celynin"), a small walled rectangular pool, which was renowned for its power to cure sick children.
The presence of surface water at this elevation was probably the reason for its designation as a site for early settlement, and the holy well itself almost certainly predates the church.
Unusually, the tower has a square lower storey surmounted by an octagonal embattled upper stage.
This parish, which derives its name from the dedication of its church to St. Celynin, who flourished towards the close of the sixth century, is situated at the north-eastern extremity of the county, bordering upon Denbighshire.
A memorable battle was fought at Cymryd, in or near the parish, in the year 880, between the forces of Anarawd, Prince of North Wales, and those of Edred, Earl of Mercia, who attempted the conquest of the country.
In this conflict Anarawd was completely victorious; he drove the Mercians from the field of battle, and continued to pursue them until they were finally expelled from the principality: the victory was called Dial Rhodri, or "Roderic's revenge," as Anarawd thus fully avenged the slaughter of his father Roderic in a descent of the Saxons upon Anglesey.
The surface of the parish is mountainous, the lands partially inclosed and cultivated, the soil various, and the surrounding scenery marked with features rather of boldness than of beauty.
Launcelot Bulkeley, in 1718, bequeathed £60, the interest to be paid to four widows, who are appointed at a vestry, and regularly receive the donation.