Ruthin is the county town of Denbighshire in north Wales and a community in the southerly part of the Vale of Clwyd. The older community, the castle as well as St Peter's Square lie on a hillside, however several more recent parts in the flood plain of the River Clwyd. This arised a number of times in the late 1990s-- flood-control jobs costing £ 3 million were completed in fall 2003. Ruthin is skirted by villages such as Pwllglas and also Rhewl. The name originates from the Welsh words rhudd (red) and also hubbub (ft), mirroring the colour of the sandstone bedrock, of which the castle was built in 1277-- 1284. The original name was Castell Coch yng Ngwern-fôr (Red Castle in the Sea Swamps). The mill neighbors. Maen Huail is a registered ancient monument attributed to the bro of Gildas and King Arthur, situated outside Barclays Bank in St Peter's Square. The population at the 2001 Census was 5,218, of whom 47 percent were male and 53 percent female. The ordinary age of the population was 43.0 years and also the population is 98.2 per cent "white". According to the 2011 census, 68 per cent were born in Wales as well as 25 per cent in England. Welsh audio speakers make up 42 per cent of the town's population.