Church of St. Decuman in Rhoscrowther was probably built in the 13th century, presumably in the place of an older, early Christian temple. In the fourteenth century it was significantly expanded. In 1852 and in the years 1869-1870 and in 1910, renovations were carried out, which fortunately did not interfere strongly with the historic substance of the building.
The church consists of a 13th-century, rectangular nave, and a narrower and shorter, rectangular chancel, also from the 13th century. In the fourteenth century, unusually on the south side, a tower was added. It is high, slender, has a crowning in the form of a parapet and battlement on protruding corbels. The corner pinnacles are already a modern addition. Except the tower, in the fourteenth century, the southern transept and northern and southern chapel were also added. The latter has dimensions close to the chancel, it was erected on its south side and covered with a separate gable roof. The chapel or northern transept has a squint leading to the choir. On its west side there is a porch, inside which a baptismal font from the 12th or 13th century was placed, originally from Pwllcrochan.
Website britishlistedbuildings.co.uk, Church of St Decumanus A Grade I Listed Building in Rhoscrowther, Pembrokeshire.
Website coflein.gov.uk, St Decuman’s church, Rhoscrowther.