No, a Briton is a citizen of Britain, just as an American is a citizen of America, Frenchman is a citizen of France, Azerbaijani is a citizen of Azerbaijan. I keep wanting to say a Britain as well, i don't like the term Briton it cujours up images of a bunch of Boudicans running around in toga like things. (you know what i mean) Then there's Canadian and Canada, surely Canadia would have been better!