Duke of Devonshire
From Vast Empire Wiki
The title of the Duke of Devonshire is a title in the Royal Parliament of Lianna, having no actual power over the super state of Devonshire on Lianna. The Duke's first son is able to hold the title of Marquis of Norfolk, and his second and third sons are able to hold the titles of Viscount of Ipswich and Baron of Dorset respectively. The current duke is Tyr Bacredi.