No AOG, you said that England an Wales were joined, as if they'd become one country, when in fact:
Welsh national identity emerged among the Celtic Britons after the Roman withdrawal from Britain in the 5th century, and Wales is regarded as one of the modern Celtic nations. Llywelyn ap Gruffydd's death in 1282 marked the completion of Edward I of England's conquest of Wales, though Owain Glyndŵr briefly restored independence to what was to become modern Wales, in the early 15th century. The whole of Wales was annexed by England, and incorporated within the English legal system, under the Laws in Wales Acts 1535–1542.