The double aureus was minted for the first time by Caracalla in 215 and, initially, its had the value and weight of two aureus. For this reason, it was called a binio (i.e. double aureus). It was a prestigious coin intended for the payment of civil servants and soldiers.
On the obverse, laureate, draped and cuirassed bust of Gallienus, surrounded by the legend GALLIENVS AVG(ustus) and a beaded rim. On the reverse, laureate bust of Emperor Augustus with features of Gallienus, surrounded by the legend DEO AVGVSTO and a beaded rim.