A five-hundred strong auxiliary infantry unit recruited from the Cugerni tribe of Germania Inferior, who inhabited the lands between the Meuse and the Rhine. They were close neighbours of the Baetasii and the Batavi, who were all used by the Romans as peregrine auxiliary troops. They are attested in stone on a milestone recovered from Newbridge near Cramond, on the Firth of Forth in Scotland, close to the eastern terminus of the Antonine Wall and contemporary with it.
It would appear likely that this unit is synonymous with Coh I Cugernum. Their first garrison in the north was possibly at Carrawburgh on Hadrian's Wall, followed by a posting near Cramond in Scotland, being removed back to the Hadrianic frontier at Newcastle-upon-Tyne when the Antonine barrier was abandoned.