is the influence of Jean Mésot on James of Saint George, Mésot having worked in Southern France before influencing Saint George in Savoy. The castle at Flint has also been described as a "classic Carrė Savoyard" as it is very similar to Yverdon Castle. Its ground dimensions are a third bigger but it shares the classic shape and style, along with the use of a corner tower as keep (donjon). Most historians attribute this to input from Edward's premier architect and castle builder James of Saint George Although construction began in 1277 and James of Saint George didn't begin work at Flint until 1280, he was in England from 1278 and was described as "ad ordinandum opera castorum ibidem", that is, charged with the design of the works at Flint. The keep is an impressive structure. Its stone walls are thick at the base and above. Access was gained by crossing a drawbridge into a central entrance chamber on the first floor. Originally there would have been at least one additional storey. These floors had small rooms built into the thick walls. A timber gallery was built on top of the keep for the visit of Edward, Prince of Wales, in 1301. On the ground floor is a vaulted passage that runs all the way around the inside of the keep. Flint's design was not repeated in any other castle built by Edward I in North Wales. The layout at Flint remains unique within the British Isles. History Flint was the first castle of what would later become known as Edward I's "Iron Ring". A chain of fortresses designed to encircle North Wales and oppress the Welsh. Its construction began almost immediately after Edward I began the First Welsh War in 1277. Five years later Welsh forces under the command of Dafydd ap Gruffydd, brother of Llywelyn ap Gruffudd, besieged the castle in an attempted uprising against the English Crown. In 1294 Flint was attacked again during the revolt of Madog ap Llywelyn; this time the constable of the castle was forced to set fire to the fortress to prevent its capture by the Welsh. The castle was later repaired and partly rebuilt. With the conclusion to the Welsh Wars, English settlers and merchants were given property titles in the new town that was laid out in front of the castle. The plantation borough was protected by a defensive ditch