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Gallia Belgica

Roman province (22 BC - 5th century)

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Before the Roman province came into existence in about 50 BC, the region was conquered by Julius Caesar during his Gallic Wars. His report, the Commentarii de Bello Gallico, described Belgic Gaul as one of the three parts of Gaul (Tres Galliæ), the other two being Gallia Aquitania and Gallia Lugdunensis. Belgica stretched from the Marne and Seine rivers, which Caesar described as a cultural boundary between the Belgae and the Celtic Gauls. In the north and east it stretched all the way to the Rhine. The official Roman province of this name was later created by emperor Augustus in 22 BC, and named after the Belgae, as the largest tribal confederation in the area. However, it also included the territories of the Treveri, Mediomatrici, Leuci, Sequani, and others who Caesar did not explicitly designate as Belgic.

The province was re-organised several times, first increased and later decreased in size. Diocletian brought the northeastern Civitas Tungrorum into Germania Inferior, joining the Rhineland colonies. The remaining part of Gallia Belgica was divided into Belgica Prima (in the eastern area of the Treveri, Mediomatrici and Leuci, around Luxembourg and the Ardennes), and Belgica Secunda (between the English Channel and the upper Meuse).

The capital of Belgica Prima, Trier, became an important late western Roman capital.

Roman conquest

In 57 BC, Julius Caesar led the conquest of northern Gaul, and already specified that the part to the north of the Seine and Marne rivers was inhabited by a people or alliance known as the Belgae. This definition became the basis of the later Roman province of Belgica. Caesar said that the Belgae were separated from the Celtic Gauls to their south by "language, custom and laws" (lingua, institutis, legibus) but he did not go into detail, except to mention that he learnt from his contacts that the Belgae had some ancestry from east of the Rhine, which he referred to as Germania. Indeed, the Belgian tribes closest to the Rhine he distinguished as the Germani cisrhenani. (Strabo stated that the differences between the Celts and Belgae, in language, politics and way of life was a small one.) Modern historians interpret Caesar and the archaeological evidence as indicating that the core of the Belgian alliance was in the present-day northernmost corner of France; the Suessiones, Viromandui and Ambiani as well perhaps as some of their neighbours who lived in the area, Caesar identified as Belgium or Belgica. These were the leaders of the initial military alliance he confronted, and they were also more economically advanced (and therefore less "Germanic" according to Caesar's way of seeing things) than many of their more northerly allies such as the Nervii and Germani Cisrhenani.

Apart from the southern Remi, all the Belgic tribes allied against the Romans, angry at the Roman decision to garrison legions in their territory during the winter. At the beginning of the conflict, Caesar reported the allies' combined strength at 288,000, led by the Suessione king, Galba. Due to the Belgic coalition's size and reputation for uncommon bravery, Caesar avoided meeting the combined forces of the tribes in battle. Instead, he used cavalry to skirmish with smaller contingents of tribesmen. Only when Caesar managed to isolate one of the tribes did he risk conventional battle. The tribes fell in a piecemeal fashion and Caesar claimed to offer lenient terms to the defeated, including Roman protection from the threat of surrounding tribes. Most tribes agreed to the conditions. A series of uprisings followed the 57 BC conquest. The largest revolt was led by the Bellovaci in 52 BC, after the defeat of Vercingetorix. During this rebellion, it was the Belgae who avoided direct conflict. They harassed the Roman legions, led personally by Caesar, with cavalry detachments and archers. The rebellion was put down after a Bellovaci ambush of the Romans failed. The revolting party was slaughtered.

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