duke Synonym

noble - aristocrat - lord - peer - nobleman - grandee - prince - magnate - patrician - baron - count - earl - marquis - viscount - ruler - sovereign - monarch - potentate - overlord - liege - chieftain - leader - head - chief - master - commander - governor - regent - suzerain - dynast - patriciate - highborn - blueblood - titled person - nobleperson - high-ranking noble - high-ranking aristocrat - high-ranking lord - high-ranking peer - high-ranking nobleman - high-ranking grandee - high-ranking prince - high-ranking magnate - high-ranking patrician - high-ranking baron - high-ranking count - high-ranking earl - high-ranking marquis - high-ranking viscount

A duke is a nobleman of the highest hereditary rank, often holding significant titles and responsibilities within a kingdom or realm. Historically, dukes were often rulers of a duchy, which is a territory or region smaller than a kingdom. Being a duke entails various privileges and duties, and it is traditionally ranked below the monarch and prince but above marquesses, earls, viscounts, and barons in the British peerage system. The title has been used in many European countries and has equivalents in several other cultures.