These FORMER dukedoms in the peerages of England, Scotland, Great Britain, Ireland and United Kingdom are currently extinct, suspended, forfeited, dormant or merged into the Crown. Name them.
Excludes extinct dukedoms which have been re-created & remain in existence (extant).
# is number of times that dukedom has been created & re-created.
"First" is year in which dukedom was FIRST created.
"Last" is year in which dukedom LAST became extinct, etc.