St Baglan's Church, Llanfaglan, stands in an isolated position in a field some 150 metres from a minor road. The size of the surrounding churchyard and the presence within the structure of the church of a stone dating from the 5th or 6th century is evidence that an earlier church or churches stood on the site. It is traditionally credited to its namesake, the 7th-century saint Baglan ap Dingad. The present church dates probably from the 13th century. The chancel was rebuilt in about 1800, when the north porch was also added. Unusually, the church escaped restoration during the Victorian era, and so its interior is still little changed since about 1800.
Describing the reasons for its Grade I listing, Cadw states it is 'a rare example of a medieval church unrestored in the 19th century, so retaining an exceptionally complete set of 18th-century furnishings'.
References:The Basilica of Santa Maria in Trastevere is one of the oldest churches of Rome. The basic floor plan and wall structure of the church date back to the 340s, and much of the structure to 1140-43. The first sanctuary was built in 221 and 227 by Pope Callixtus I and later completed by Pope Julius I.
The inscription on the episcopal throne states that this is the first church in Rome dedicated to Mary, mother of Jesus, although some claim that privilege belongs to the Basilica di Santa Maria Maggiore. A Christian house-church was founded here about 220 by Pope Saint Callixtus I (217-222) on the site of the Taberna meritoria, a refuge for retired soldiers. The area was made available for Christian use by Emperor Alexander Severus when he settled a dispute between the Christians and tavern-keepers.
The church underwent two restorations in the fifth and eighth centuries and in 1140-43 it was re-erected on its old foundations under Pope Innocent II.