Duke is a title of nobility given to a male of high social status and rank. It is typically granted by a monarch or ruler in recognition of the recipient's achievements or contributions to society. Dukes often have significant power and influence within their respective domains, and are responsible for overseeing the governance and administration of their territories. The title of Duke is often hereditary, passing down through generations within a noble family. Dukes are commonly referred to as "Your Grace" or "My Lord" as a sign of respect.