Æ22 - Hadrian ΚΩΙΩΝ

Cos — the island birthplace of Hippocrates — maintained its own civic bronze coinage under Roman imperial oversight through the Conventus of Halicarnassus, the administrative circuit that grouped several Aegean communities under a single assizes jurisdiction centered on the Carian coast. Hadrian's reign saw a notable uptick in provincial civic bronze issues across the eastern Aegean, partly driven by his philhellenic building programs and his repeated tours through Greek territories between 124 and 131 AD.

The island's identity as the home of ancient medicine was a persistent point of civic pride in its coinage throughout the imperial period.