[2] St Ceinwen's Church is in a rural location in the middle of Anglesey, north Wales.

It is set in a hollow at the side of the road near the village of Cerrigceinwen, about 2 miles (3.2 km) to the south-west of Llangefni, the county town of Anglesey.

[5] Some repair work was carried out to a medieval church on this site in 1839 (although the date of its original construction is unknown) and the current structure was erected in 1860.

It is built from rubble masonry dressed with freestone; the roof is made of slate and edged with stone.

One from the 12th century is cut at its head with a circle containing a rough cross of petals and has a decorated key design on the shaft.

[2][6] A survey of church plate within the Bangor diocese in 1906 recorded a chalice and a paten dating from 1823.

[12] The church has national recognition and statutory protection from unauthorised alteration as it has been designated as a Grade II listed building, which is the lowest of the three grades of listing, designating "buildings of special interest, which warrant every effort being made to preserve them".

The antiquarian Angharad Llwyd described it (before the 1839 building work) as "a neat small edifice, and appropriately fitted-up".

[13] Writing in 1846, after some rebuilding, Longueville Jones said that the east window was "one of the purest models, as to proportion and workmanship", in Anglesey, and noted the "richly sculptured compartments" of the font.