Pagus of Brabant
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50°45′N 3°59′E / 50.75°N 03.99°E The pagus of Brabant (Latin: Pagus Bracbantensis; Dutch: Brabantgouw) was a geographical region in the early Middle Ages, located in what is now Belgium. It was the first region known to have been called Brabant, and it included the modern capital of Belgium, Brussels. It was divided between the neighbouring counties of Flanders, Hainaut and Louvain (Leuven) in the eleventh century. It was the eastern part, which went to the Counts of Louvain, which kept the name in use, becoming the primary name of their much larger lordship. This led to other regions later being named Brabant – in particular, the French and Dutch-speaking areas east of the Dyle, including Leuven and Wavre, which are still in provinces known as "Brabant"; and secondly the province of North Brabant in the Netherlands.
The area of the old pagus of Brabant is and was multi-lingual, divided between Dutch (Flemish) speakers in the north, and French (including Picard) speakers in the south. Today the region includes not only bi-lingual Brussels, but also parts of the modern Dutch-speaking Belgian provinces of Flemish Brabant and East Flanders, and the French-speaking provinces of Hainaut and Walloon Brabant.

In its oldest known forms, Brabant lay between the rivers Scheldt, Rupel, Dyle, Lasne and Haine.[1]
This means the territory included not only Brussels but also much of what is now modern Hainaut and Eastern Flanders, including Aalst. Louvain and Wavre, which later came to be seen as part of Brabant, were originally just outside the pagus of Brabant – both in the pagus of Hasbania.
The modern Dutch province of North Brabant was not originally part of Brabant but acquired the name because it was later integrated politically.
In the modern Belgian province of Antwerp, Klein-Brabant is geographically in the original pagus of Brabant.
Etymology
In its earliest forms such as those collected by Nonn, the first part of the name was written with variants such as brac-, brag-, brach-, braim, and brei. According to Deru, this element could derive from Proto-Germanic *brakti implying fallow land, or *braki implying marshy land (related to modern Dutch broek). These are both believed to be derived from *brekaną a reconstructed Proto-Germanic word meaning 'to break'.[2]
The second element of the name -bant is found in several other Frankish pagus names in this region, such as nearby Oosterbant, and Swifterbant and Teisterbant, to the north, and is believed to be connected to the medieval concept of a "ban", relating to areas of duty and authority.[citation needed]
Pre-history
As demonstrated by Deru, the pagus of Brabant between the Scheldt, Haine, Lasne and Rupel rivers, corresponds closely with the northern extension of the Nervii, a Belgic tribe, both in terms of archaeological evidence such as Nervian coin finds, and also because it lay within the Roman-era civitas of the Nervians, and its successor, the medieval bishopric of Cambrai - both of which had their main centres in the south, in the areas of Hainaut and Cambrai.