Bouillon was one of the places where the relationship between the town and its landscape was immediately obvious. The Semois makes a deep curve through the Ardennes, the houses occupy the narrow ground beside the river, and directly above them the enormous Château Fort de Bouillon stretches along a rocky ridge. We had already crossed a very varied part of Luxembourg and Belgium, but Bouillon felt different again: much of the town seems to exist beneath, around or within sight of the fortress.
Our experience began at the official motorhome area on Rue de la Poulie. We were there in summer and it was extremely busy, but despite the number of motorhomes we still managed quite easily to find a place for our 23-foot-long vehicle. That was a pleasant surprise because at first sight the area appeared almost full. Once parked, however, the stay itself was good. The location was quiet despite the number of vehicles, and both the castle and the town were close enough to reach easily on foot.
The motorhome facilities were showing their age. They were a little dirty when we were there and certainly did not look new, but they were still functional. More importantly, everything was completely free of charge. Access with our motorhome was also straightforward. Considering the location, the popularity of Bouillon and how close the area is to the centre, we found it a remarkably useful municipal stop. It was crowded, but that was really the main disadvantage; we still had a pleasant stay and rated it 5 out of 5.
The reason Bouillon attracts so many visitors becomes obvious almost immediately. The castle does not merely stand beside the town as one monument among many. It occupies three rocky spurs high above the Semois and dominates virtually every view of the old centre.
Fortifications may have existed on the site as early as the eighth century, while the castle’s documented medieval development goes back more than a thousand years. Its location was strategically important because routes between Reims, Liège and Aachen crossed this part of the Ardennes. The steep rock and the river provided natural protection, while the fortress controlled the valley below.
The name most closely associated with the castle is Godfrey of Bouillon — Godefroy de Bouillon. He became one of the principal leaders of the First Crusade in 1096. Before leaving for the Holy Land, he transferred control of the castle to the Prince-Bishopric of Liège in order to finance the expedition.
That decision connected this relatively small Ardennes town with one of the largest military and religious movements of the Middle Ages. Godfrey took part in the capture of Jerusalem in 1099 and subsequently became ruler of the newly established crusader territory there. He refused the title of king and was instead associated with the title Advocate of the Holy Sepulchre.
Bouillon never forgot him. His name appears throughout the town, and the castle’s identity remains inseparable from the crusader who left it more than nine centuries ago.
Yet the fortress visible today is not simply Godfrey’s medieval castle preserved unchanged. It was repeatedly altered as warfare developed.
Thick medieval walls were useful against arrows and early siege weapons, but artillery changed military architecture fundamentally. Fortresses needed lower, stronger defensive works capable of resisting cannon fire and allowing defenders to fire back.
Bouillon consequently evolved over centuries. One of its most important periods of reconstruction came under Louis XIV. After French forces took control of the fortress, Sébastien Le Prestre de Vauban, Louis XIV’s famous military engineer, redesigned important parts of its defences.
Vauban is the same engineer whose work appears in fortified cities across France and whose influence can also be seen in Luxembourg. At Bouillon he adapted an already ancient fortress to the requirements of seventeenth-century warfare rather than creating an entirely new fortification.
That history explains the strange mixture visible today. There are medieval chambers and passages, but also later artillery positions, thickened defences, underground galleries and structures created centuries after Godfrey had disappeared.
The interior is an extensive network rather than a conventional castle arranged around elegant furnished rooms. Corridors run through the rock, vaulted chambers sit beneath the fortifications and stairs connect different defensive levels. The architecture constantly reminds visitors that this was primarily a military structure rather than a comfortable aristocratic residence.
One of the greatest problems during a siege was water. An army could surround a fortress for weeks or months, and impressive walls were useless if the defenders ran out of drinking water. Bouillon therefore had systems allowing the garrison to maintain access to water even when enemies controlled the surrounding ground.
Food, ammunition and communication presented similar problems. The castle had to function almost as an independent settlement while under attack. Storage rooms, protected passages and defensive positions were therefore as important as the walls visible from outside.
The high position also provided an enormous advantage. From the fortifications it was possible to watch movement through the Semois valley and along the approaches to the town. The same geography that today provides views across the wooded Ardennes once allowed soldiers to see an approaching enemy well before it reached the castle.
The Semois itself is central to Bouillon. It loops around the rocky ridge in a way that almost encloses parts of the town and castle. Streets follow its banks, bridges repeatedly connect the two sides and the river creates a surprisingly intimate centre despite the enormous fortress overhead.
That made Bouillon feel considerably smaller on foot than it appears when first approaching it by road. The river, centre and castle are concentrated into a relatively narrow area. From our motorhome stop we did not need to move the vehicle again simply to reach the town.
This mattered with a motorhome nearly seven metres long. Bouillon’s streets were never designed for modern recreational vehicles, and having a proper place where we could leave ours and continue from there was much more sensible than trying to drive as close as possible to every attraction.
The town below the castle also has its own history beyond Godfrey and the Crusades. Bouillon became the centre of a small duchy and for long periods occupied an unusual political position between larger neighbouring powers.
During the eighteenth century it became unexpectedly important in European publishing. Pierre Rousseau established the Société Typographique de Bouillon, taking advantage of the relative freedom available in the duchy. Books, journals and other works could be produced here which were more difficult to publish elsewhere under stricter censorship.
For a small Ardennes town, Bouillon therefore developed a surprisingly international intellectual role. Material printed here circulated well beyond the Semois valley.
The castle, meanwhile, remained militarily occupied until 1830. By then Europe had changed completely. The medieval lordship associated with Godfrey, the French fortress modified by Vauban and the later military installation had all occupied the same rock at different times.
After the Belgian Revolution, Bouillon became part of the new Belgian state. The castle gradually changed from an active military site into the historic monument that defines the town today.
Its relationship with the surrounding Ardennes is equally important. Dense forest covers most of the hills outside the centre, and the Semois valley provides an extensive network of walking routes. One marked walk around the castle and river is roughly seven kilometres long, climbing from the Semois into the surrounding woodland before returning towards the fortress.
That landscape explains why Bouillon feels very different from a town whose castle happens to stand on a hill. Here the fortress, rock, river and forest all belong to the same geographical structure.
There are newer attractions built around the medieval history as well. The Bouillon Medieval Experience uses audiovisual presentations to explain the First Crusade, while the castle contains the Scriptura exhibition devoted to the history of writing. Falconry demonstrations are also held within the fortress.
But even without turning the town into a succession of ticketed attractions, Bouillon is easy to understand simply by moving through it. The Semois is always nearby, the wooded slopes rise abruptly around the centre and the walls of the castle remain above almost everything.
For us, the motorhome area was an important part of making that work. In summer it was overcrowded, and the old service facilities could certainly be improved, particularly in terms of cleanliness. Yet those disadvantages did not outweigh the positives. We still found a place for our 23-foot motorhome without difficulty, the area was quiet, access was easy, nobody caused us any problems, and we could leave the vehicle there and have the castle and town close by. The fact that both parking and services were completely free made it even better.
Bouillon was therefore not simply another castle town on our route. Its geography is unusual enough that the whole centre feels shaped by the fortress. The Semois wraps around the rock, the Ardennes rise immediately behind the houses and more than a thousand years of military history occupy the ridge above.
And unlike some historic sites where almost everything has disappeared except a few foundations, Bouillon still has enough of its enormous fortress intact to make its former role easy to understand from almost anywhere in the town.
Our own experience was much simpler than its history: a busy summer arrival, a surprisingly easy place for the motorhome, old but usable free services and a quiet stay close to the centre. But above us was the castle that Godfrey of Bouillon left behind to finance his journey towards Jerusalem — and that single decision helped make the name of this small Belgian town known far beyond the Ardennes.