Church of Saint Tysilio

The Church of Saint Tysilio is an Anglican parish church, dating to the 19th century with elements from earlier periods. It is constructed of rubble stone with ashlar dressings and slate roofs, utilizing local silver-grey slates for the chancel and vestry. The church features a broad nave with a low-pitched roof, a chancel situated along the south half of the nave, and a parallel-roofed vestry extending along the north side. A south porch and a west bellcote complete the external composition, all topped with coped gables and cross finials, with cast-iron rainwater goods.

The nave's windows were installed in 1898, consisting of three square-headed, two-light windows with segmental-pointed heads to the lights on the north side, similar two- and three-light windows to the south, and a 1898 porch to the left. The windows have leaded glazing with small pieces of tinted glass. The porch features a shouldered gable, a moulded segmental-pointed doorway with spandrel panels and a hoodmould stepped over a blank shield. A matching doorway is located within the porch, accessed by a board door with cover strips and ornate wrought iron hinges, all dating to 1898. The west end features a similar two-light window with a hoodmould and cusped depressed-arched heads to the lights, with uncarved stops to the hoodmould, and a relieving arch above. A small plain bellcote is present with a pointed opening and an ashlar gable topped with a cross finial, both dating from 1898. The chancel's south wall retains two older windows of uncertain date – a two-light window with sandstone chamfered jambs and cambered heads, and a small single pointed light with spandrel panels. The east end is defined by a broad segmental pointed three-light window from 1898, characterized by ogee panel tracery and a hoodmould. A low, narrow gable end of the vestry is set back to the right, featuring a two-light window with plain chamfered rectangular lights, also from 1898, alongside a single purple stone light to the north.

Within the nave's south wall are three inscribed stones. The first, located beneath the third window, reads "clutorigi fili paulini marinilatio" (Clutorix son of Paulinus Marinus of Latium). A second, broken inscription beneath the second window reads "euolengg- fil- litogeni hic iacit" (Evolenggus son of Litogenus lies here). A third, fragmentary inscription to the right of the third window jamb reads "RIAT". These stones are believed to date from the 5th to 6th centuries. There is also a reported, but unverified, incised stone at the southwest corner featuring a circle enclosing five circles in a Maltese cross form, believed to date from the 7th to 9th centuries.

The nave's interior boasts whitewashed, plastered walls and a boarded panelled ceiling sloped on all four sides. The windows have cambered rear arches. A pointed plastered chancel extends to the right of the east end of the nave, with a low, pointed door leading to the parallel vestry to the left. The chancel features an open, three-bay roof from 1898 with collars and king-struts, and two broad plastered arches to the vestry on the north side. The sanctuary is marble-paved and includes a small piscina on the south wall. Fittings include a late Gothic style, octagonal font from 1898, adorned with quatrefoils and traceried shafts. Plain pews and a pine pulpit on a stone base are also present. A mid-19th century organ, brought from Milford Haven in the 20th century and possibly originating from a country house, stands with a panelled case. Wrought-iron altar rails from 1898 feature IHS and crown motifs. An inscribed cross-stone is located at the nave’s northeast corner (potentially the one also inscribed 'carantacus'). A memorial in good, pedimented white marble on grey marble commemorates John Mathias of Kille (Cilau, Llandysilio East), who died in 1765.