Of the ancients, we have Dio Cassius on Commodus who writes very entertainingly about Commodus' vices (Epitome of Book LXXIII) and the Historia Augusta on Commodus. (Both from LacusCurtius)
The image on top of the blog comes from Imperial Portraits of Commodus and shows Commodus as Hercules, from the Esquiline Hill, Capitoline Museum, Rome, among others, with kind permission by Bill Storage. âThe Herculean scene depicted is the taking of apples from Hesperides, thereby acquiring virtue and immortalityâ.
Roman Coins of Commodus shows a selection of Commodus coins. The AR denarius below comes from Ed Flinn's Hobbyblog with the author's kind permission.