mike wightman
SOC-14 10K
There is no such thing as a sector duke title. Delphine in Duchess of Mora and is considered to be sector duke for the Marches, but that is not an official title, rather a first among equals.
If Deneb was a subsector in the Deneb sector there would be a duke of Deneb, but the system Deneb is not the subsector capital.
If Deneb was a subsector in the Deneb sector there would be a duke of Deneb, but the system Deneb is not the subsector capital.