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About Diadumenian
- Diadumenian (; Latin: Marcus Opellius Antoninus Diadumenianus Augustus) (September 14/19, 208 – 218), was briefly Roman Emperor from May to June 218.
- He was born to Macrinus, his father, of which he was co-emperor, and Nonia Celsa, whose name may be fictitious, on 14 September 208.
- He was elevated to Caesar in May 217, and after Elagabalus revolted a few days later, Diadumenian was elevated to co-emperor.
- After Macrinus was defeated in the Battle of Antioch, on 8 June 218, Diadumenian was sent to the court of Artabanus V to ensure his safety; however, he was captured and executed along the way, in late June.
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