Æ21 - Caracalla ΘΥΑΤΕΙΡΗΝΩΝ

Thyatira, located in Lydia, was one of the most industrially active cities in Roman Asia Minor — its guild system was unusually well-developed, with associations of dyers, wool-workers, tanners, and bronze-smiths all attested in inscriptions. The city's civic coinage under Caracalla falls within the broader expansion of local bronze issues that accompanied the Constitutio Antoniniana of 212 AD, which extended Roman citizenship across the empire and dramatically increased the administrative and commercial demand for small-denomination bronze at the provincial level.

The conventus of Pergamum, under which Thyatira fell for judicial and administrative purposes, oversaw a dense concentration of minting cities during this period.