According to Holder, a total of 12 Raetorum cohortes appear to have been raised, 10 of them not later than the rule of Claudius (41-54) and 2 shortly after 70 AD. But there is dispute about how many regiments survived into the 2nd century. This is due to confusion about how many regiments shared the name I Raetorum because the name is attested in three provinces in roughly the same periods. It has been suggested there were as many as 3 such regiments in the 2nd century in Cappadocia, Raetia and Germania Inferior. Holder appears to follow this. Spaul suggests it was a single unit, I Raetorum equitata c.R., being moved about frequently. Here the 3-unit theory is followed. The c.R. title only appears in Germania Inferior so the unit there is called cohors I Raetorum equitata c.R.. The unit in Cappadocia, the subject of this article, was also equitata, and so is denoted cohors I Raetorum equitata. The unit in Raetia is denoted simply cohors I Raetorum as there is no evidence it was equitata.
The regiment was probably raised shortly after 70 AD. It first appears in the datable epigraphic record in 75, when it was based in Moesia. Not later than 135 it was transferred to Cappadocia. In 135 it was part of the force deployed against an Alan invasion by the provincial governor and historian Arrian. It was then transferred, by 148, to Asia province. It was probably still there in 240-4, the time of its last datable inscription, a votive stone at Eumenia (Ishekli, Turkey). By this time it had acquired the honorific title Gordiana (from the emperor Gordian I r. 238).