The church of the Holy Trinity in Marcross was built in the 12th century, and in the fourteenth century enlarged by a chancel and a tower on the west side. Three hundred years later, its upper part was rebuilt. In 1893, the church was renovated during which, among other things, roofs were replaced and a porch was added, although one can also find information that it dates from the 17th / 18th centuries.
The church consists of a rectangular nave and a shorter and narrower, four-sided chancel on the eastern side. The western side is crowned with a four-sided tower from the 14th century, however its upper part was rebuilt in the early modern period. The porch on the south side is a modern addition, but it protects the romanesque, semicircular portal with two heads, from around 1150, at the entrance to the nave. The original windows topped with trefoils from the 14th century are located only in the north and south walls of the chancel. One of them, on the south side, was the so-called window of the lepers, allowing the sick to view the altar from the outside, during services. Inside the church there is a chancel arch from the 12th century, separating the nave from the presbytery and a large romanesque baptismal font from around 1200.
Website britishlistedbuildings.co.uk, Church of the Holy Trinity A Grade I Listed Building in St. Donats (Sain Dunwyd), Vale of Glamorgan.
Website wikipedia.org, Holy Trinity Church, Marcross.