St Donats (Welsh: Sain Dunwyd) is a village and community (or civil parish) in the Vale of Glamorgan in south Wales, located just west of the small town of Llantwit Major. The community includes the hamlets of East Monkton and West Monkton. It is named after the 6th-century saint, Dunwyd, a friend of Saint Cadoc. It had a population of 732 in the UK census of 2011.
St. Donat's church lies in a depression and is unremarkable from the exterior but contains Stradling family monuments in the Stradling chapel. It is a 12th-century Grade I listed building with a Grade I listed medieval cross in the churchyard.
The village is internationally known as the location of the 12th century St. Donat's Castle which is now an international boarding school occupied by Atlantic College, the first of fourteen United World Colleges.
The first three maps are provided by A Vision of Britain through Time
These maps were found on Wikimedia Commons
These maps of Glamorgan post-1974 were found on another site and are very useful for sorting out the up-to-date geography of the area