Crai is a village in the Brecon Beacons National Park in the county of Powys, Wales and the historic county of Breconshire. The population of Cray community at the 2011 census was 241.[1] Within the community are the hamlet of Felin-Crai and many dispersed farms around the valley of the Afon Crai. The river is dammed 2 km / 1.5 mi southwest of the village to form Cray Reservoir.[2] Crai means fresh, raw water.[3] The famous Llywel Stone (see Llywel) was found close to the Crai/Trecastle boundary. A history of the village is contained in Lewis, D. Craionog: Hanes plwyf Defynog : yn cynnwys y rhanbarthau cynlynol; Crai, Glyntawy, Senni, Glyntarell, a Maescar. Merthyr Tydfil : H. W. Southey a'i Feibion, Cyf, Argrffwyr, 1911.