An Inventory of the Ancient Monuments in Glamorgan: Volume III: Medieval ... - Royal Commission on the Ancient and Historical Monuments of Wales - Google Books

http://books.google.de/books?id=LOHH20BzfmsC&pg=PA218-IA1

Fifty-seven castles founded in Glamorgan by 1217 are here described. These include mottes. castle-ringworks, and presumed Welsh earthworks, all without masonry, as well as sixteen masonry castles ranging from well known sites at Cardiff, Coity, and Ogmore,…