Some of the last sestertii were struck by Aurelian (270–275 AD). During the end of its issue, when sestertii were reduced in size and quality, the double sestertius was issued first by Trajan Decius (249–251 AD) and later in large quantity by the ruler of a breakaway regime in the West, named Postumus (259–268 AD), who often used worn old sestertii to overstrike his image and legends on. The double sestertius was distinguished from the sestertius by the radiate crown worn by the emperor, a device used to distinguish the dupondius from the "as" and the Antoninianus from the denarius.