Principality of Wales was created in 1216.
Wales is a principality, not a duchy. Prince Charles is the current Prince of Wales.
It's in Wales. I believe 'South Wales' refers specifically to the southernmost part of the principality.
Andorra, Asturias, Grand prince, Lamballe, Liechtenstein, Monaco, Principality of Sealand, Principality of Wales.
Principality of Rügen ended in 1325.
Principality of Svaneti ended in 1857.
Principality of Guria ended in 1829.
Principality of Ryazan ended in 1521.
Principality of Bulgaria ended in 1908.
Principality of Orange ended in 1713.
Principality of Galilee ended in 1187.
Principality of the Pindus ended in 1944.