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Wiki information Diadumenian:
Diadumenian, was the son of the Roman Emperor Macrinus, and served his father briefly as Caesar and as Augustus. He was so named due to being born with a caul that formed a 'diadem'. Diadumenian was born on 14 September 208 or, according to Historia...
Nonia Celsa is the name given by the Historia Augusta to the wife of Roman Emperor Macrinus, who ruled briefly in 217–218. She was the mother of Diadumenian.