Antoninianus
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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 minimal silver
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)
The rapid decline in silver purity of the antoninianus
Radiate crown
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A radiant or radiate crown, also known as a solar crown, sun crown, Eastern crown, or tyrant's crown, is a crown, wreath, diadem, or other headgear symbolizing the Sun or more generally powers associa
Antoninianus
…introduced by Caracalla in early 215 AD. It was silver, similar to the denarius, except that it was slightly larger and featured the emperor wearing a radiate crown, indicating it was a double denomination. Antoniniani depicting women (usually the emperor's wife) featured the bust resting upon a crescent moon. Even…
Coin of Bahram I of the Sassanian Empire (late 3rd century AD, Ctesiphon mint)
Egyptian aegis of Isis wearing solar crown (664–343 BC)
Coin of Ptolemy IV Philopator, depicting his deified father Ptolemy III (d. 222 BC)
Helios in his chariot, early 4th century BC, Temple of Athena, Ilion