It is first conferred to Nicholas conDoin, the grandfather of Borric, when he extended the Western Realm of the Kingdom of the Isles to the former imperial province of Bosania, stopping short of the Free Cities. Since then, the Dukedom holds a favorable relationship with the Free Cities, treating them fairly and even generously.
As Crydee is located on the western edge of the continent, it earned the title Warden of the West
The heraldic banner is a golden gull, and above it a small golden crown, marking the Duke as a member of the royal house. But after Martin Longbow became Duke, the golden crown was removed.