French: Comté de Looz) was a county in the Holy Roman Empire, which corresponded approximately with the modern Belgian province of Limburg.

During the middle ages the counts moved their court to a more central position in Kuringen, which today forms part of Hasselt, capital of the province.

[1] In the fourteenth century the male line ended for a second time, at which point the prince-bishops themselves took over the county directly.

All of the Dutch-speaking towns in the Prince-Bishopric, with the status of being so-called "Good Cities" (French: bonnes villes), were in Loon, and are in Belgian Limburg today.

From the earliest mentions, the counts of Loon exercised power in three distinct geographical areas, with different medieval names.

The eastern and western kingdoms of the old Carolingian dynasty, the forerunners of later France and Germany, contested for control, together with the local magnates.

[4] Medieval records note that Giselbert and his brothers were related by blood to local nobility, such as Lambert I, Count of Louvain, and Arnulf of Valenciennes, but they do not give exact relationships.

The only medieval source to mention a parent for Count Giselbert is the chronicle of the Abbey of St Truiden, which names his father as Otto.

Her possessions cannot be explained by her proposed ancestry, or her known husband, and so it has long been suggested that she must have first married a Count Arnold, because he is presumed to have had no heirs.

In Loon, the enduring conflict with his Liège overlords culminated in an 1179 campaign by Prince-Bishop Rudolf of Zähringen, whose troops devastated the county's capital at Borgloon in 1179.

This area gave power over abbey lands in Sint-Truiden, Halen, and Herk de Stad, effectively defining what is today still the southwestern border of Belgian Limburg.

When the bishopric was annexed by Revolutionary France in 1795, the county of Loon was also disbanded and an adjusted version of the territory became part of the French département of Meuse-Inférieure, along with Dutch Limburg to the east of the Maas.