Solidus - Theodosius I CONCORDIA AVGGG, Constantinopolis

Theodosius I struck this emission during the co-regency period when he, Gratian, and Valentinian II held the Augustan title simultaneously — hence the triple-Augustus reverse legend. Gratian's murder by Magnus Maximus in 383 effectively ended that arrangement, giving this issue a tight historical bracket. Constantinople's mint was still relatively young as a gold-striking facility, having been elevated under Constantine, and Theodosian solidi from this period show the mint consolidating what would become the dominant gold coinage of the late empire for another century.