County of Loon
Belgian Limburg corresponds closely to the medieval territory of the County of Loon (French "Looz"), which originally centred on the fortified town of Borgloon. It came to possess most of Haspengouw, and also the large part of the Kempen which the province contains today. As part of Loon, Belgian Limburg eventually became subject, not only spiritually but also politically, to the Prince-Bishopric of Liège.