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Village in Powys, Wales

Caersws (Caersŵs; ) is a village and community on the River Severn, in the Welsh county of Powys (Montgomeryshire) 5 mile (8 km) west of Newtown, and halfway between Aberystwyth and Shrewsbury. It has a station on the Cambrian Line from Aberystwyth to Shrewsbury. At the 2011 Census, the community had a population of 1,586 – a figure which includes the settlements of Clatter, Llanwnnog and Pontdolgoch. The village itself had a population of slightly over 800.

The name is derived from the Welsh placename elements "Caer " and "Sŵs". "Caer" translates as "fort" and likely refers to the Roman settlement. The derivation of the second element is less certain. Thomas Pennant and later writers note that the fort was the termination of the Roman Road from Chester (via Meifod), the name of the road was Sarn Swsan or Sarn Swsog and it is thought that the town and the road share their etymology. The meaning of Swsan/Swsog is again, uncertain, but two local traditions hold that this is a personal name, either of a Queen Swswen (a name which may translate as "The Blessed/Pure Kiss") a Celtic leader who is said to have fought a battle in the vicinity around the time of the Roman occupation who was equated with Estrildis by Oliver Mathews, or it is named for a Roman lieutenant "Hesus". Furthermore, the linguist John Rhys noted that the dialect of Mid Wales Welsh (Y Bowyseg) was closer to the Gaulish language than its neighbours, and concluded that the area had pre Roman links to Gaul. This may suggest a link between Caersŵs and the God Esus venerated by the Parisii and Treverii. Other suggested etymologies include the name retaining a Roman era dedication to Zeus, and the fact that "sws" (not sŵs) can be literally translated to "Kiss" in modern Welsh has led to a number of developing folk etymologies.

Caersws was the location of two Roman forts of Roman Wales. Although the Mediolanum of the Antonine Itinerary has since been identified as Whitchurch in Shropshire, Caersws is sometimes identified as the Mediolanum among the Ordovices described in Ptolemy's Geography, although others argue for Llanfyllin Further, this second Mediolanum may be identical or distinct from the "Mediomanum" (lit. (Literally) "Central Hand") mentioned by the Ravenna Cosmography.

The Church of St Gwynog dates from the 15th century and was restored in 1863. It contains a 15th rood screen and loft which the Royal Commission on the Ancient and Historical Monuments of Wales describes as "exceptional; the best preserved of thirty known to have existed in the county". Maesmawr Hall, to the south east of the village, was built in the early 19th century and is a Grade II* listed building.

Downhill Mountain Biking has flourished in forestry at Henblas farm, to the north of the village, with a number of national races being held there. The current series The Caersws Cup began in March 2009. Cymru Alliance club Caersws F. C. are based in the village, and play their home matches at the Recreation Ground. Caersws is home to current and past champions of a number of sporting disciplines, leading some to christen it the "Sporting Capital of Wales".