Aureus - Tetricus I HILARITAS AVGG

Tetricus I ruled the Gallic Empire from Cologne under constant pressure — internal usurpations, frontier raids, and the looming reconquest threat from Aurelian's reunified Roman Empire. The HILARITAS AVGG legend, invoking the joy or cheerfulness of two Augusti, refers to the co-rule of Tetricus I with his son Tetricus II, elevated to Caesar and later Augustus. The irony is considerable: the empire collapsed at the Battle of Châlons in 274, after which Aurelian paraded both men in his triumph before, unusually, granting them clemency and provincial administrative posts.

Gold aurei of the Gallic Empire are scarce by any measure — the breakaway state's mint output leaned heavily on debased antoninianii for daily commerce.