Principality of Wales ended in 1282.
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 Salerno was created in 851.
Principality of Göttingen was created in 1279.
Principality of Rügen was created in 1168.
Principality of Ryazan was created in 1129.
Principality of Bulgaria was created in 1878.
Principality of Orange was created in 1163.
Principality of Galilee was created in 1099.
Principality of the Pindus was created in 1941.