Diadumenian Mid May- 8 Jun 218 AD Markianopolis, Moesia Inferior.

This coin may show the eclipse of 212 AD or be predictive of the 218 AD eclipse. Both eclipses were visible in Markianopolis, modern day coastal Romania. Diadumenian was the son of Emperor Macrinus. The legions of Syria revolted against Macrinus and declared Elagabalus as emperor. Elagabalus worshiped the sun god and would not have looked at eclipses as good omens. Diadumenian was killed when Elagabalus came to power. Photo from Forvm Ancient Coins