Megas doux
TITLE FOR THE COMMANDER-IN-CHIEF OF THE BYZANTINE NAVY
Megadux; Megas Doux; Megaduke; Megas douks; Mégas doúks
The megas doux (, , "grand duke") was one of the highest positions in the hierarchy of the later Byzantine Empire, denoting the commander-in-chief of the Byzantine navy. It is sometimes also given in English by the half-Latinizations megaduke or megadux.