Editing Dux (section)

===Original usage===
Until the 3rd century, ''dux'' was not a formal expression of rank within the Roman military or administrative hierarchy.<ref>[[Fergus Millar]], ''The Roman Near East, 31 B.C.-A.D. 337'' (Harvard University Press, 1993), pg. 191 [https://books.google.com/books?id=IA-YlZqHv90C&pg=PA191 online]<!-- ISSN/ISBN needed --></ref>

In the [[Roman army]], a ''dux'' would be a general in charge of two or more legions. While the title of ''dux'' could refer to a [[Roman Consul|consul]] or [[imperator]], it usually refers to the [[Roman governor]] of the [[Roman province|provinces]]. 

In writing his [[Commentarii de Bello Gallico|commentaries]] on the [[Gallic Wars]], [[Julius Caesar]] uses the term only for [[Celt]]ic generals, with one exception for a Roman commander who held no official rank.<ref>[[Thomas Ernst Josef Wiedemann|Thomas Wiedemann]], “The Fetiales: A Reconsideration,” ''Classical Quarterly'' 36 (1986), p. 483. The Roman called ''dux'' is [[Publius Licinius Crassus (son of triumvir)|Publius Crassus]], who was too young to hold a commission; see [[Publius Licinius Crassus (son of triumvir)#Early military career|discussion of his rank]].</ref>