Group

Gallia Belgica (Roman province)

Substate Defunct 22 BCE – 486 CE Capital Augusta Trevorum > Trier Rheinland-Pfalz Germany

Gallia Belgica (Belgic Gaul) is a province of the Roman empire located in Belgium, present-day northern France, Luxembourg, part of the present-day Netherlands below the Rhine, and the German Rhineland.

It is originally composed of the lands of the alliance of the Belgae who had fought against Julius Caesar, plus the lands of their southeastern neighbors the Treveri, Mediomatrici and Leuci.

The southern border of Belgica, formed by the Marne and Seine rivers, is reported by Caesar as the original cultural boundary between the Belgae and the Gauls who he distinguished as Celts.

The province is first increased and later decreased in size over time.

It must have originally bordered upon the Rhine, which is how Pliny the Elder describes it, but this area was colonized by Roman military colonies and incoming German tribes from east of the Rhine, which quickly develop their own frontier-based administration.

Much later, the territory is reduced when the emperor Diocletian brings the northeastern Civitas Tungrorum into Germania Inferior, joining the Rhineland colonies, and the remaining part of Gallia Belgica is divided into Belgica Prima in the eastern area of the Treveri, Mediomatrici and Leuci (which had not originally been Belgic), around Luxembourg and the Ardennes, and Belgica Secunda between the English channel and the upper River Meuse.

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

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Moran, J. (n.d.). Gallia Belgica (Roman province). History Atlas. Retrieved 27 September 2026, from https://www.historyatlas.com/groups/gallia-belgica-roman-province/

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