The crossword solution for the term 'Principality British' is WALES, which is a country located in the United Kingdom. WALES is a principality, meaning it is a self-governing region that is part of a larger state. It is bordered by England to the east and the Irish Sea to the west. WALES has its own distinct culture, language, and history, and is home to many iconic landmarks such as Snowdonia National Park and Cardiff Castle.