The church is dedicated to Cynhaiarn, a 5th-century saint. It was originally the parish church for Porthmadog. Its nave dates from the 12th century, and the northtransept was added in the 16th century. The south transept was built in 1622. Most of the interior fittings are Georgianin style and date from 1832. It came into the care of the Friends of Friendless Churches in 2003, since when repair work has been undertaken.
Architecture
Structure
It is constructed in stone rubble, with the walls of the nave and the east side of the chancel being stucco. The roofs are of modern slates. Its plan consists of a short nave, north and south transepts, and a short chancel. At the west end is a bellcote. The entrance is through a west door. The windows in the nave and transepts have two lights, and at the east end are three lancet windows. The interior is plastered above a timber dado. The floor of the body of the church is stone-flagged, and there is a painted floor in the sanctuary. At the west end is a gallery.
Fittings and furniture
Dating from 1832, the pulpit is a three-decker, approached by nine steps, below which is a lectern with a reading shelf, and under this is the reader's desk. On each side of the altar are box pews. The gallery is supported on slender columns. The chamber organ by Flight and Robson dates from 1834 and was given by a Mrs Walker; it cost £30. It has a Gothic style case. On each side of it are six steeply raked pews and many carry the names of the families who used them. One of the pews is curtained off for mothers to feed their babies. The font stands on an octagonal pillar of limestone and was erected in 1900. There are also a number of memorials. The stained glass includes windows by James Powell and Sons dated 1899 and 1906.
Memorials
An earlier grave records the early passing of David Owen, a local blind composer and harpist who was known as "Dafydd y Garreg Wen" or David of the White Rock, as he came from Garreg Wen Farm. Owen wrote a tune called Dafydd y Garreg Wen allegedly on his deathbed after calling for his harp. Amongst the memorials is one to John Ystumllyn, also known as Jack Black. He was a black man brought back from Africa by a member of the Wynne family who lived at Ystumllyn, which can be seen from the church. It was fashionable at the time to have a black servant, and he was eventually given his own house. He had seven children and died at the end of the 18th century. Local people claim him as their ancestor. There is a memorial to James Spooner, the surveyor who built the Ffestiniog Railway and members of his family in the form of a stone urn surrounded by iron railings. It is located alongside the boundary wall, to the right when facing the church from the gate. There are many children's graves. Daniel Morris, the first harbourmaster of Porthmadog, is buried there, together with three of his young daughters. There are also the graves of ropemakers, pilots, ships' captains and many young sailors drowned at sea, as well as that of Captain Thomas Jones, an ancestor of Lord Snowdon.
