The Principality of Wales is part of the United Kingdom, having been conquered by King Edward I of England in 1282.
THE JEWISH COMMUNITY
Jews began to settle in Wales in the early eighteenth century and a Jewish community is recorded in Swansea from around 1731. Increased Jewish immigration in the 19th century led to the founding of new Jewish communities in Cardiff and elsewhere in Wales. By 1900 there were small Jewish trading communities in most industrial towns in the South Wales Valleys. The Jewish population of that area, which reached a peak of 4000 - 5000 in 1913, has declined with only Cardiff retaining a sizeable Jewish population, of about 2000 in the 2001 Census.
Jewish Genealogical Society of Great Britain
Jewish Communities & Records - UK (JCR-UK) website - http://www.jewishgen.org/jcr-uk - records of all Jewish communities and congregations throughout the United Kingdom. For Welsh communities, see Wales.
The All UK Database: http://www.jewishgen.org/databases/UK/