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 Bitlis ended in 1847.
Principality of Trubetsk ended in 1566.
Principality of Halberstadt ended in 1807.
Principality of Abkhazia ended in 1864.
Principality of Montenegro ended in 1910.
Principality of Mingrelia ended in 1857.
Principality of Albania ended in 1925.
Principality of Lippe ended in 1918.