Duke

Duke is a male title either of a monarch ruling over a duchy, or of a member of royalty, or nobility. A duchy is the territory or geopolitical entity ruled by a duke, whereas his title or area is often called a dukedom. The Duke of Cornwall holds both the dukedom (title) and duchy (estate holdings), the latter being the source of his personal income; those living on the ducal estates are subjects of the British sovereign and owe neither fealty nor services to the duke ''per se. S''imilarly, the Imperial monarch rules and owns the Duchy of Lancaster as Duke of Lancaster, but it is held separately from the Crown, with the income of the duchy estates providing the Sovereign's Privy Purse.