As per the Amtwiki:

"The third highest title in the Amtgard Order of Precedence, above Count but below Archduke. Generally awarded for a single term as Kingdom-level Monarch. The proper form of address is "Your Grace", or "His Grace James, Duke of York". If appropriate, "Sir" may be added after "Grace". It is also appropriate to just refer to a noble by their title and estate, like "the Duke of York"
Internal Links
Crowns and Coronets

Hand Drawn Ducal Titles
External Links
Duke An Article on the Amtgard Wiki

 

Male Female Description and Notes

Coronet: Strawberry leaves

Equivalents:

Doge, Dux, Herzog, Duc, Duque, Duca, Pfalzgraf, Shogun, Bretwalda, Chiangchun, Tarkhan.

 

dukephoenix.jpg

Addressed as:

"Your Grace"
dukephoenix.ai duchessphoenix.ai
Suggested Criteria for Duke/Duchess as per Kingdom Corpora
-- same as BL.
4.43 Serve the Kingdom six months as Monarch
16.3 Serve the club six months as Monarch.
   
5.3.c. Duke (Duchess) may be granted for serving one complete term as Monarch and is addressed as “Your Grace.”
VI. F.1. Serve the club six months as Monarch.
7.8 Reference only to new Duchal Monarch.
4.53 Serve as Kingdom Monarch for at least one (1) term, discretion of Kingdom Monarch
18.G. Served well for one term as Emperor. (18.I., Duke/Duchess for continuous and outstanding service to Amtgard.)
12.3.5.2. Serve the Kingdom an exceptionally successfully completed term as Kingdom Monarch or repeated terms in office at the province level (4 or more terms).
VII.3.a. i. Serve the club six months as Monarch
9.6.3 Serve the club an exceptionally successfully completed term as Kingdom Monarch.