Julius Caesar — Posthumous Denarius 42 BC | Rome Mint | L. Mussidius Longus | AR Denarius, 3.68 grams | NGC Ch VF | Strike 4/5, Surface 3/5 | Banker’s Mark

Few Roman Republican coins carry a more dramatic historical message than this 42 BC denarius bearing the portrait of Julius Caesar, struck just two years after his assassination. Issued by the moneyer Lucius Mussidius Longus, the type is catalogued as Crawford 494/39, RSC 29 and CRI 116. The obverse presents the laureate head of Caesar facing right, while the reverse assembles a remarkable group of symbols around a cornucopia resting on a globe: a rudder to the left, a winged caduceus and the apex to the right, with L·MVSSIDIVS·LONGVS identifying the moneyer. The British Museum independently records the type as a Rome-minted denarius of 42 BC.

The portrait is particularly important because Caesar was already dead when this coin was struck. His assassination on the Ides of March in 44 BC had plunged Rome into another round of civil war, and by 42 BC the struggle had become a direct contest between the forces of Caesar's heirs and allies—Mark Antony and Octavian—and the assassins Brutus and Cassius. Caesar's portrait therefore functions as far more than decoration. It presents the murdered dictator as the legitimate political ancestor of the Caesarian faction. Mussidius Longus was effectively putting Caesar's image into the hands of soldiers and citizens at precisely the moment when control of Rome's future was being decided. Contemporary scholarship and auction research specifically connect this issue with the Caesarian cause and the campaign leading to Philippi.

The reverse is an exceptionally sophisticated piece of political symbolism. The rudder and globe evoke Caesar's command over land and sea and the expansion of Roman power under his leadership. The cornucopia represents abundance and prosperity, while the winged caduceus, associated with Mercury, conveys prosperity, commerce and favorable fortune. The apex, the distinctive pointed cap of the flamen Dialis, refers to Caesar's position as Pontifex Maximus, Rome's chief priest. Together, the devices construct an image of Caesar as the source of military power, religious authority and prosperity for the Roman world.

The timing makes the coin especially compelling. In 42 BC, Octavian and Antony had formed the Second Triumvirate with Lepidus, and their armies were moving east to confront Brutus and Cassius. The decisive confrontation came at Philippi in Macedonia in October 42 BC. Cassius was defeated and killed after the first battle, while Brutus was defeated in the second and subsequently took his own life. With the Caesarian forces victorious, the political order represented by the old Republic was effectively broken beyond repair. This denarius was therefore struck during the final struggle that transformed Caesar's assassination from a political act into the foundation myth of the emerging Roman imperial system.

The NGC Ch VF, 4/5 strike designation is complemented by the coin's strong surviving portrait and substantial reverse detail. The banker’s mark is itself an interesting reminder that this was a working piece of Roman money, handled and tested in antiquity rather than preserved as a ceremonial object. Most importantly, the coin gives us the rare combination of Caesar's actual portrait, his posthumous political rehabilitation, and the propaganda of the Caesarian faction, all compressed into a 42 BC silver denarius. It is a coin struck literally between the assassination of Caesar and the birth of the Roman Empire—one of the most consequential moments in ancient history.