Duke

n. ruler of duchy, high-ranking noble

v. fight, be engaged in a struggle, battle

A duke is a nobleman, historically of highest rank below the King or Queen, and usually controlling a duchy. The title comes from the Latin dux, which had the sense of "military commander" and was employed both by the Germanic peoples themselves and by the Roman authors covering them to refer to their war leaders.
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Noun
1. a British peer of the highest rank
(hypernym) peer
2. a nobleman (in various countries) of high rank
(hypernym) Lord, noble, nobleman

n. duke

(v. i.)
To play the duke.
  

(n.)
In some European countries, a sovereign prince, without the title of king.
  

(n.)
In England, one of the highest order of nobility after princes and princesses of the royal blood and the four archbishops of England and Ireland.
  

(n.)
A leader; a chief; a prince.