Diadumenian
…Diadumenian ( dy-AD-uu-MEE-nee-ən; Latin: Marcus Opellius Antoninus Diadumenianus; 14 September 208 – June 218) was the son of the Roman emperor Macrinus and served as his co-ruler for a brief time in 218. His mother, Macrinus's wife, is called Nonia Celsa in the unreliable Historia Augusta, though this…