The Citadel of Namur is a mighty fortress located on the hill at the confluence of the Samber and the Meuse. This site was first used by the Romans, who had a fortified outlook post here in the 3rd and 4th century, later the Counts of Namur built their castle here.Between 1542 and 1555 a complete new Citadel was constructed by Charles V of Habsburg. During the following centuries the Citadel was several times besieged, more fortifications were added and it became one of the largest fortified constructions in Europe.