This tower, called Vieux-Joncs (old reeds), belonged to the Teutonic commandry of Liège. It is one of the oldest civil buildings in the city, with its lowest part dating from before 1423. The upper part was built in the 16th century and was used as an office by the grand-pasteur. As for the name Vieux-Joncs, it refers to the Land commandry of Alden Biesen, which means ‘old reeds’ in Dutch and was the seat of the ‘bailiwick of the reeds’ that reported to the commandry of Liège.