Oversized Imperial duchy in the Spinward Marches comprising the County of Vilis, the County of Jewell, the entire Regina Subsector, and a number of worlds in the Aramis Subsector and Lanth Subsectors, including those of the Paya Cluster.

The Duchy of Regina has six counties:

• County Aledon: 11 rich worlds on the Spinward Main including Regina
• County Dethenes: The Kinorb cluster plus 2 lesser systems from the Aramis Subsector
• County Enopia: A seven world backwater of the Regina Subsector including Enope
• County Croesus: An eight world backwater of the Regina Subsector including Inthe
• County Kristie: The Menorb cluster
• County Arlington: The end of the Spinward Main including Efate

The current Duke of Regina is Norris of the House Aledon.