Wikipedia
Llanrhaeadr-ym-Mochnant is a village in Powys, Wales.
It was an important site in the ancient commote of Mochnant, this is indicated by ym-Mochnant in its placename which means 'in Mochnant'.
Until 1974, Llanrhaeadr-ym-Mochnant was split into two civil parishes, the northern parish being in historic Denbighshire and the southern parish in historic Montgomeryshire, this reflected the division of the ancient commote in the 12th-century. The divide continued between 1974 and 1996, with the former Denbighshire parish being placed in Clwyd and former Montgomeryshire parish in Powys. However, in 1996 both parts of Llanrhaeadr-ym-Mochnant were united within the county of Powys.
In the 2001 Census it had a population of 1,470, of whom 55% were Welsh-speaking. The population at the 2011 census had reduced to 1,195.