Cohors [prima] Antiochensium [quingenaria] equitata ("[1st] part-mounted [500 strong] cohort of Antiochenses") was a Roman auxiliary regiment containing cavalry contingents. The cohort stationed in Dacia at castra Drobeta.
References Academia Română: Istoria Românilor, Vol. 2, Daco-romani, romanici, alogeni, 2nd. Ed., București, 2010,
See also Roman auxiliaries List of Roman auxiliary regiments