Capel Gellionnen (Gellionnen and Graig Unitarian Church)

This is a Unitarian chapel, originally built in 1692 and largely refronted in the 18th century, with later 19th-century alterations. The exterior is of whitewashed render with a slate roof. The long-wall facade features two large arched central windows, with 20th-century glazing replicating the original appearance; two doors, and two outer gallery lights. The windows have raised stucco frames with keystones. A marble plaque from the late 19th century is set between the central windows, replacing an earlier slate plaque which is now within the building. The central windows have small, multi-paned glass, with a thicker inner division creating a marginal pane effect. The doors have cambered heads, with later 19th-century panelled double doors concealed by 20th-century cladding, and the outer windows are cambered-headed, horned sashes with marginal glazing bars. A lean-to vestry, with a sheet-metal roof, adjoins the end wall. The rear of the chapel has two similar large arched windows, with a blocked arched door and a buttress on each side.

The interior is long, with a curved plaster ceiling and moulded cornices along the long walls. A pulpit stands on the entrance wall, opposite a three-sided gallery with flat underside and stepped open-back benches, with a panelled back against the walls. The gallery has a deep, plain cornice under a low rail, featuring stick balusters. Fourteen plain iron columns, arranged as 2x4x2 under the gallery front, and three thicker iron columns against each of the three walls, indicate that the gallery was a later addition. Small 19th-century fireplaces are located on each end wall. The pews are in three blocks; those to the sides are canted and curved and date from the later 19th century, while those in the centre feature panelled woodwork from around 1800, which was altered in the later 19th century. The 'set fawr,' or enclosed area around the pulpit, was remade in the later 19th century, incorporating some fielded panelling from around 1800, and extends completely around the pulpit with two entries and curved angles. The pulpit itself has a base from around 1800, with serpentine-curved sides, a flat front, and curved steps. It features a later 19th-century columned and panelled front, balustrades to the platform, and stairs. A moulded plaster arch, also from the later 19th century, is situated behind the pulpit, framing a marble memorial plaque to the Reverend John Evans (1835-88). A front wall plaque from 1801 is on the left end wall, indicating the chapel’s original construction in 1692 "for the use of a Society of Protestant Dissenters." To the right of the pulpit is a fine three-colour marble memorial to the Reverend Thomas Morgan (d. 1813), signed "W. Williams, Moribyr(?) fecit," with a fluted border to a sarcophagus-shaped plaque above a small urn, and a plaque below for Reverend John James (d. 1864). Plaques to the left commemorate Reverend Josiah Rees (d. 1801) and Owen Rees of Gelligron, a London publisher (d. 1837), the latter signed R. Brown of London. Enclosed gallery stairs are located up each side, with 19th-century four-panel doors and panelled partitions. A clock, dated 1873 and inscribed "the gift of Mr Evan Davies Llachartfach," is positioned at the centre of the gallery.