Legio III Augusta in the context of "Year of four emperors"

The Year of the Four Emperors, AD 69, was the first civil war of the Roman Empire, during which four emperors ruled in succession, Galba, Otho, Vitellius, and Vespasian. It is considered an important interval, marking the change from the Julio-Claudians, the first imperial dynasty, to the Flavian dynasty. There were several rebellions and claimants, with shifting allegiances and turmoil in Rome and the provinces.

In 68, Vindex, legate of Gallia Lugdunensis, revolted against Nero and encouraged Galba, governor of Hispania, to claim the Empire. The latter was proclaimed emperor by his legion in early April. He was notably supported by Otho, legate of Lusitania. Soon after, the legate of a legion in Africa, Clodius Macer, also rebelled against Nero. Vindex was defeated by the Rhine legions at the Battle of Vesontio, but they too rebelled against Nero. On 9 June 68, Nero took his own life after being declared a public enemy by the Senate, which made Galba the new emperor. Galba was unable to establish his authority over the Empire, as several of his supporters were disappointed by his lack of gratitude. He especially adopted Piso Licinianus as heir (Galba was childless and elderly), instead of Otho, who, it had widely been assumed, would be chosen. Angered by this disgrace, Otho murdered Galba on 15 January with the help of the Praetorian Guard, and became emperor instead. Unlike Galba, he rapidly earned considerable popularity, notably by bestowing favours and emulating Nero's successful early years.

Leptis or Lepcis Magna, (Arabic: لبدة الكبرى, romanized: Libda al-Kubrā) also known by other names in antiquity, was a prominent city of the Carthaginian Empire and Roman Libya at the mouth of the Wadi Lebda in the Mediterranean.

Established as a Punic settlement prior to 500 BC, the city experienced significant expansion under Roman Emperor Septimius Severus (r. 193–211), who was born in the city. The 3rd Augustan Legion was stationed here to defend the city against Berber incursions. After the legion's dissolution under Gordian III in 238, the city was increasingly open to raids in the later part of the 3rd century. Diocletian reinstated the city as provincial capital, and it grew again in prosperity until it fell to the Vandals in 439. It was reincorporated into the Eastern Empire in 533 but continued to be plagued by Berber raids and never recovered its former importance. It fell to the Muslim invasion in c. 647 and was subsequently abandoned.

Lucius Clodius Macer was a legatus of the Roman Empire in Africa during the reign of Nero. He revolted in May 68, cutting off the food supply of Rome, possibly at the instigation of Calvia Crispinilla. Although encouraged by Galba, Macer raised a legion Legio I Macriana liberatrix in addition to the Legio III Augusta that he already commanded, presumably raising suspicion that Macer also harbored imperial ambitions. In October 68, Galba had him killed by the procurator Trebonius Garutianus. Papirus, the centurion of Mucianus, was implicated in his assassination.

Macer produced denarii which are extremely rare today. Only about 85 have been found, of which only 20 bear his portrait. He uses the formulaic abbreviation S C (senatus consulto) on his denarii; this otherwise had only rarely appeared on Roman silver coins since about 40 BC. Scholars speculate that this, and his decision to portray himself without a laurel wreath or a diadem, as evidence that he portrayed his revolt as being against Nero, and not the senate.