Wales was annexed to the Kingdom of England in the middle ages, but the Kingdom of England ceased to exist in 1707, when the United Kingdom was formed. Today,

Wales was annexed to the Kingdom of England in the middle ages, but the Kingdom of England ceased to exist in 1707, when the United Kingdom was formed. Today, Wales is thought of as a constituent country of the United Kingdom, on par with England, Scotland, and Northern Ireland. From a standpoint of the monarchy, it's all one unified realm of The Crown.