The town and castle, owned by Arnoul's grandson Godefroi IV de Florennes (c. 1010–1080), became a fief of the Prince-Bishopric of Liège in 1070.

[3] The powerful Rumigny-Florennes family held the castle as vassals of Liège until the late 13th century.

[4] In 1281, Isabelle de Rumigny, who had inherited the castle, married Thibaut of Lorraine, lord of Neufchateau.

Thibaut was a warrior prince, and fought in the wars between the kings of France, the emperors of Germany and other potentates.

Starting in 1417, Isabella, Duchess of Lorraine, undertook work that included building the terrace and, in 1425, laying out a 20 hectares (49 acres) park.

[2] A document from 1420 states that the people of Surice, Mazée, Vodelée, Soulme, Omezée, Villers-en-Fagne, Roly, Neuville, Vodecée, Villers-le-Gambon, Franchimont, Corenne and Anthée were required to mount guard over the castle.

[2] For the last thirty years the Missions Seminary has leased the castle to the Municipality of Florennes, who in turn have rented it to the Justice of the Peace and the Music Academy.

The process of registering the castle buildings and the park with the Institut du Patrimoine as a Wallon Heritage site were initiated in May 2004.

[2] A 1744 travel book Les Délices du Païs de Liege ("The Delights of the country of Liege") described the property as having several large gothic buildings flanked with towers, and a large garden laid out in excellent taste.

A terrace and gallery were decorated with elegant pillars surmounted by statues, and looked over a parterre with a fountain in the center.

[11] Of the medieval castle, all that remains today are two towers connected by a 20 metres (66 ft) curtain wall along the west side of the courtyard.

The orangery, a lower extension running from the main building to the "Billard" tower, was built between 1825 and 1844 on foundations that date from the 18th century.

[7] A passage from beneath the building now gives access to stairs that led down to the park, built at the start of the 18th century.