The Citadel of Sisteron

Controlling the Durance passage

At Sisteron, the Durance flows through a narrow gap between the Rocher de la Baume and the ridge supporting the citadel. Holding this high ground meant controlling the passage between Provence and Dauphiné. The fortress overlooks the town, the river crossing and, to the north, the area around the confluence with the Buëch.

Opposite, the almost vertical limestone layers of the Rocher de la Baume form a tall, striated cliff. The river passes at its foot, where the roads are also squeezed into the gap. The terrain explains more clearly than a map why Sisteron long held such strategic importance.

From the ramparts to views of the valley

From the entrance, ramps, gateways and stairways connect successive defensive enclosures. Their angled bastions allowed defenders to bring crossing fire to bear in front of the walls. Higher up, the wall walk follows the narrow rocky ridge: the visit leads from defences designed for artillery to the old medieval wall.

The terraces provide enough distance to understand Sisteron’s position. To the south, the town’s rooftops occupy the right bank of the Durance; to the north, the valley widens beyond the confluence. From one level to another, the ramparts frame different views of the bridges, neighbourhoods and mountains.

From the Wars of Religion to Vauban

The present citadel was not built in a single campaign. The sieges of the Wars of Religion demonstrated the need to strengthen Sisteron’s defences. Major works began in the late 16th century; by the early 17th century, the main enclosures already followed their present layout. Royal engineer Jehan Sarrazin, followed by Jean de Bonnefons, contributed to this transformation.

Vauban became involved later, in 1692, after the Duke of Savoy’s invasion of the upper Durance valley. He proposed an extensive scheme for the town and its fortress, but only parts of it, including the powder magazine, were completed. Alterations continued in the 19th century, with new gateways and an underground staircase cut into the rock to link the citadel with the town’s northern gate.

A future king in the dungeon

The tower overlooking the fortress also served as a prison. In 1639, Richelieu had Prince John Casimir Vasa imprisoned here, suspecting him of supporting Spain’s interests against France. Detained in Sisteron for several months, he became King of Poland a few years later. His reconstructed cell recalls this episode during the visit.

The chapel of Notre-Dame du Château has also changed use several times. Converted into military accommodation, then used as barracks and a prison, it regained its original interior space through restoration. Today, the visitor displays explain the stages of the citadel’s construction through a model and audiovisual presentations.

From bombing to restoration

On 15 August 1944, the Allied bombing of Sisteron severely damaged the citadel and struck the town. Much of the chapel was destroyed, along with several military buildings. The walls visible today have therefore undergone a long period of repairs, as well as the alterations made for defensive purposes.

The Arts, Théâtre, Monuments association oversees the monument’s restoration and presentation to the public. The rebuilt chapel received stained-glass windows by Claude Courageux; the open-air theatre, set among the bastions on the northern slope, hosts the Nuits de la Citadelle festival. The former military stronghold has become a place for visits and performances, whose proceeds help maintain it.

Back down to Sisteron

From the terraces, you can pick out the streets and rooftops you will return to on the way down to the centre. Leave time for a walk at the foot of the rock and beside the Durance: after the citadel’s views from above, the cliffs take on a different scale when seen from the riverbanks.