I was informed this is Balbinus. From the WIkipedia: "Balbinus (Latin: Decimus Caelius Calvinus Balbinus Pius Augustus; c. 165 29 July 238), was Roman Emperor with Pupienus for three months in 238, the Year of the Six Emperors."
And: "When the Gordians were proclaimed Emperors in Africa, the Senate appointed a committee of twenty men, including Balbinus, to co-ordinate operations against Maximinus Thrax. On the news of the Gordians' defeat, the Senate met in closed session in the Temple of Jupiter and voted Pupienus and Balbinus as co-emperors, though they were soon forced to co-opt the child Gordian III as a colleague. Balbinus was probably in his early seventies: his qualifications for rule are unknown, except presumably that he was a senior senator, rich and well-connected. While Pupienus marched to Ravenna, where he oversaw the campaign against Maximinus, Balbinus remained in Rome, but failed to keep public order. The sources suggest that after Pupienus's victorious return following Maximinus' death, Balbinus suspected Pupienus of wanting to supplant him, and they were soon living in different parts of the Imperial palace, where they were later assassinated by disaffected elements of the Praetorian Guard."