Cornelius Fuscus (?–86) was a Roman general who fought campaigns under the Emperors of the Flavian dynasty. During the reign of Domitian, he served as prefect of the imperial bodyguard, known as the Praetorian Guard, from 81 until his death in 86. Prior to this appointment, Fuscus had distinguished himself as one of Vespasian's most ardent supporters during the civil war of 69, known as the Year of the Four Emperors.
In 85 the Dacians, led by King Decebalus, invaded the Roman Empire at Moesia, a province located south of the Danube. In response, Domitian dispatched Cornelius Fuscus to the region with five legions. Although Fuscus was initially successful in driving the invaders back across the border, the prefect suffered defeat when he was ambushed along with Legio V Alaudae during an expedition into Dacia, at the First Battle of Tapae. The entire legion was annihilated, and Fuscus killed.
About six months earlier, Gaius Julius Vindex, the governor of Gallia Lugdunensis, had rebelled against tax policies of Emperor Nero. To gain support, he had called upon Galba, the governor of Hispania Tarraconensis, to declare himself Emperor. Galba was one of Rome's oldest generals, enjoying considerable prestige and widespread political support. Nero's own popularity was already on the decline, but nonetheless, he managed to crush the revolt by quickly sending the governor of Germania Superior, Virginius Rufus to Gaul, who defeated Vindex in a battle near Vesontio. Galba was declared a public enemy, and his legion confined to the city of Clunia. The victory proved insufficient to restore Nero's damaged reputation however. Rumours quickly spread across the Empire that multiple legions were defecting to Galba's side. By June of 68, the Senate had voted Galba the Emperor and declared Nero a public enemy. Nero's fate was ultimately sealed when Nymphidius Sabinus, the prefect of the Praetorian Guard, bribed his soldiers to desert their Emperor. On June 9 68, Nero committed suicide, and with him the Julio-Claudian dynasty came to an end.
Despite Nero's unpopularity, many provinces were reluctant to accept Galba as his successor. Cornelius Fuscus was among those who declared their support for the new Emperor early. According to Tacitus, Fuscus was vital in acquiring the support of an unspecified Roman colony in Spain, Northern Italy, or Gaul, for which service he was rewarded with the procuratorship of Illyricum. Galba's troubles were far from over however, and soon legions posted in Germania, as well as the Praetorian Guard in Rome, revolted. On January 15 68, Galba was murdered and replaced by Otho, governor of Lusitania, who himself quickly perished against the armies of Vitellius, governor of Germania. Shortly thereafter, Titus Flavius Vespasianus, a general stationed in Judaea, declared war on Vitellius.
Embracing the cause of Vespasian, [Fuscus] lent the movement the stimulus of a fiery zeal. Finding his pleasure not so much in the rewards of peril as in peril itself, to assured and long acquired possession he preferred novelty, uncertainty, and risk.The defection of the Antonius Primus and Fuscus was a major blow for Vitellius.
Sometime around 84 or 85 the Dacians, led by King Decebalus, crossed the Danube into the province of Moesia, wreaking considerable havoc and killing the Moesian governor Oppius Sabinus. Domitian immediately launched a counteroffensive, personally travelling to the region accompanied by a large force commanded by Cornelius Fuscus. Fuscus successfully drove the Dacians back across the border in mid-85, prompting Domitian to return to Rome and celebrate an elaborate triumph. The victory proved to be short-lived however, as early in 86, Fuscus embarked on an ill-fated expedition into Dacia, which resulted in the complete destruction of the fifth legion, Legio V Alaudae, near Tapae. Fuscus was killed, and the battle standard of the Praetorian Guard lost.