duchy

A duchy is the territory of a duke or duchess. Historically, the title of dux was given by the Romans to military commanders with territorial responsibilities. This title was adopted by barbarian invaders and used for rulers of large areas in their kingdoms, as well as in France and Germany.12

In Germany, early tribal areas like Franconia, Swabia, Bavaria, and Saxony emerged as "stem duchies" when appointed dukes became independent. Over time, the power of dukes varied, with some becoming practically independent rulers while others saw their authority diminish with the rise of smaller principalities. In France, powerful duchies like Normandy and Burgundy were initially almost independent of the crown before being gradually reunited. In Italy, significant duchies included Milan, Florence, and Modena.2

The title of duke is a European rank of nobility, typically ranking below a prince or king, and is one of the ranks of British nobility.2