Note 146 — THE AUXILIA DURING THE FIRST TWO CENTURIES A.D.
Reading edition
The earliest I know of is legio III Augusta et auxilia eius, which dates from 158. viii. 2637. Other instances are a dedication at Bonn by legio I Minervia pia fidelis Severiana Alexandriana cum auxilis (xiii. 8017), and a Pannonian inscription of the reign of Gallienus which mentions vexillationes legionum Germaniciarum et Brittanniciarum (at least this seems to be intended) cum auxilis earum. iii. 3228. The formula is certainly a rare one.