Antoninianus

Also known as pre-reform radiate

thumb|upright=1.2|Row 1: Elagabalus ([[silver 218–222 AD), Trajan Decius (silver 249–251 AD), Gallienus (billon 253–268 AD Asian mint);Row 2: Gallienus (copper 253–268 AD), Aurelian (silvered 270–275 AD), barbarous radiate (copper), barbarous radiate (copper)]] thumb|upright=1.2 |The antoninianus, introduced in 215 AD, continued the denarius's slow decline in silver purity. The antoninianus or pre-reform radiate was a coin used during the Roman Empire thought to have been valued at 2 denarii. It was initially silver, but was slowly debased to bronze with a mi