text: The Merovingian Franks gradually gained control of the region during the 5th century, under Clovis. Due to the fragmentation of the former Roman Empire, Vulgar Latin regionally developed along different lines and evolved into several langue d'oïl dialects, which in Wallonia became Picard, Walloon and Lorrain. The oldest surviving text written in a langue d'oïl, the Sequence of Saint Eulalia, has characteristics of these three languages and was likely written in or very near to what is now Wallonia around 880 AD. From the 4th to the 7th century, the Franks established several settlements, probably mostly in the north of the province where the romanization was less advanced and some Germanic trace was still present. The language border (that now splits Belgium in the middle) began to crystallize between 700 under the reign of the Merovingians and Carolingians and around 1000 after the Ottonian Renaissance. French-speaking cities, with Liège as the largest one, appeared along the Meuse, while Gallo-Roman cities such as Tongeren, Maastricht and Aachen became Germanized.
  The Carolingian dynasty dethroned the Merovingians in the 8th century. In 843, the Treaty of Verdun gave the territory of present-day Wallonia to Middle Francia, which would shortly fragment, with the region passing to Lotharingia. On Lotharingia's breakup in 959, the present-day territory of Belgium became part of Lower Lotharingia, which then fragmented into rival principalities and duchies by 1190. Literary Latin, which was taught in schools, lost its hegemony during the 13th century and was replaced by Old French.
  In the 15th century, the Dukes of Burgundy took over the Low Countries. The death of Charles the Bold in 1477 raised the issue of succession, and the Liégeois took advantage of this to regain some of their autonomy. From the 16th to the 18th century, the Low Countries were governed successively by the Habsburg dynasty of Spain (from the early 16th century until 1713–14) and later by Austria (until 1794). This territory was enlarged in 1521–22 when Charles V, Holy Roman Emperor gained the Tournai region from France.