Dunno, who this dude is. But he’s got this satorial dictatorish look about him. But Wikipedia says the following:

Valerian also known as Valerian the Elder, was Roman Emperor from 253 to 260 AD. He was taken captive by Sassanian Persian king Shapur I after the Battle of Edessa, becoming the first Roman Emperor to be captured as a prisoner of war, causing shock and instability throughout the Empire.