Y Gaer is a Roman fort situated near modern-day Brecon in Mid Wales, United Kingdom. Y Gaer is located at grid reference SO00332966.
Wikipedia https://en.wikipedia.org/wiki/Y_Gaer
Official Website http://www.coflein.gov.uk/en/site/92001/
Address LD3 9, United Kingdom
Coordinates 51°57'23.565" N -3°27'6.322" E