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 Abkhazia ended in 1864.
Principality of Koknese ended in 1206.
Principality of Arbër ended in 1255.
Principality of Moers ended in 1702.
Principality of Salm ended in 1811.
Principality of Gjirokastër ended in 1416.
Principality of Krk ended in 1480.
Principality of Trubetsk ended in 1566.