commodus and hercules
Commodus as Hercules, click for larger image M. P. Speidel, in Commodus the God-Emperor and the Army, (on the Tittianus Altar in Dura-Europos), The Journal of Roman Studies Vol. 83 (1993), pp. 109-114, illustrated. (JSTOR, limited access), writes:
In A.D. 192, the last year of his reign, Commodus threw restraint to the winds and had the senate declare him a god. He assumed such titles as Conqueror of the World, Roman Hercules, and All-Surpasser and named the twelve months of the year after himself. Founding Rome anew, he gave it the name Colonia Commodiana and ordered the legions likewise to be called Commodianae. Before the year was out, on 3rd December, he was murdered, his memory cursed.
and later:
While Commodus was declared Caesar on 27 November 176 and reckoned his rule from that day, he became sole ruler only on 17 March 180, when Marcus Aurelius died. He therefore established 17 March as a second anniversary day of his reign to be celebrated. After Commodus' death, 17 March was abolished as a holiday and, unlike his birthday, not revived when Septimius Severus restored Commodus' good name.