Batavi (Germanic tribe)

The Batavians or Batavi were a Roman-era Germanic people that lived in Batavia in the eastern Rhine delta — an area that is now in the Netherlands, but then lay upon the northernmost border of the Roman Empire in continental Europe. The Roman author Tacitus said that they originated as a group of Rome-allied Chatti, who settled in Batavia around 50–15 BC. Archaeological evidence shows that they joined a Celtic-influenced community that had already been living there long before the arrival of the Romans. Throughout the several centuries in which they appear in historical records the Batavians were continually associated with elite cavalry units in the Roman military, who were famous for their ability to cross rivers while armed and on horseback, without breaking line.

Batavia was already referred to by the Roman leader Julius Caesar as the "Island of the Batavi" (Latin: Insula Batavorum) in his account of his campaigns in Gaul in 58–52 BC — although he did not explain who the Batavi were. Tacitus, writing in about 100 AD, reported that they had a special old alliance (antiquae societatis) with the empire as major contributors to the Roman military, and they did not pay any other form of tribute or tax. Some modern scholars have suggested that this relationship was established by Caesar himself who had a Germanic cavalry unit which fought for him in Gaul, and then in his Roman civil war. According to these proposals, this force evolved into the later bodyguard of Caesar's imperial successors in the Julio-Claudian dynasty, who continued to recruit Batavians for this role.

Apart from the bodyguard, the Batavi in the first century AD provided 9 or 10 auxiliary cohorts which each included cavalry, all with their own Batavian command structures. Based upon estimates of the Batavian population at about 40,000 people, of whom 5000 or more were posted in the Roman military, historians believe the Batavi had a highly militarized society, even if they were able to recruit from neighbouring populations. While at least one cohort stayed close to home, eight played an important role in the Roman subjugation of Britain. In 69 AD, the "Year of the Four Emperors", Julius Civilis, a Batavi leader and Roman citizen, led the Batavian Revolt during a period when several Roman leaders were fighting for control of the empire. The revolt involved not only the Batavi and their neighbours the Cananefates, but also allies from both inside and outside Roman Gaul. Vitellius, a Roman governor of their region who was contending to become emperor, was their main enemy at first, and was defeated. However, the Batavi were themselves eventually forced to come to an agreement with the victorius new emperor, Vespasian.

After this revolt, the Batavian forces were once again posted in Britain, but in the second century Batavian forces began to be assigned to the Danubian frontier. In the second and third centuries the "Batavian" military units recruited in the provinces where they were based, and gradually became less ethnically Batavian. Networks of military families, many now Roman citizens, continued to identify as Batavi into the second century, but often while living outside of their home region. Although their name survived in the names of Roman military units and the Roman military base at Passau (Latin: Batavis), the Batavians themselves disappeared from the historical record during the Crisis of the Third Century, when Rome lost control of Batavia to tribes from north of the Rhine including Frisii, Chamavi. The people there were also referred to now for the first time as Franks. The main Batavian Roman settlement at Nijmegen was abandoned by 250 AD. When the Romans recovered partial control of the region generations later, they moved large parts of the native population to other parts of the empire. In the 4th century, the Salian Franks from north of the Rhine were allowed to remain in the area by the Romans and from this point on the Batavian region was Frankish.