The date of the legion's creation is also not certain, although Graham Webster assigns it to the year 101. The earliest dated inscription referring to the legion, which lists the posts Lucius Cossonius Gallus held during his career, again entangles the XXI "Rapax" in the origins of this legion, for Gallus was first a military tribune with the first unit, then some years later commissioned commander of the II "Traiana" most likely after he had distinguished himself in Trajan's First Dacian War. About the only firm date is that Legio II "Traiana" was in existence by 108, the year Gallus was suffect consul.