I say we have named and numbured legions for rome here is a list of roman legions


Legio I Germanica (or Augusta)
Legio I Adiutrix
Legio I Italica
Legio I Macriana Liberatrix
Legio I Minervia
Legio I Parthica could be used for apropatine campaign
Founded in 197 AD by Septimius Severus for his campaign against the Parthians
http://www.unrv.com/military/legions.php list for more and source