Æ14 - Caracalla ΜΗΤΡΟ ΚΟ

Edessa occupied a uniquely precarious position in the early 3rd century — a client kingdom that had only recently been converted into a Roman province under Septimius Severus in 214 AD, its civic coinage reflecting the awkward transition between Abgarid dynastic autonomy and Roman administrative control. The abbreviation ΜΗΤΡΟ ΚΟ on this issue denotes the city's grant of metropolis status, a honorific Caracalla distributed with some political calculation as he moved through the eastern provinces during his Parthian campaign preparations.