"The castrum of Pieusse is mentioned as early as 1119. Pieusse was the seat of a barony that included Alaigne and Routier. The lordship belonged to the archbishop of Narbonne, who exercised high, middle, and low justice. It was in 1229 that Pieusse was assigned by Guy de Lévis, lord of Mirepoix, on the orders of Saint-Louis, to the archbishops of Narbonne, who kept it until the Revolution.

Sold as national property, the castle became a simple dwelling and then an agricultural outbuilding. The building is rectangular in plan, with two stories on the ground floor and an attic floor. The stairwell that connected the floors, located in the southeast corner, collapsed in 1987.

The west gable was lit, on the 2nd and 3rd floors, by two twin bays with window seats. The north facade, with a high door at the level of the first floor, is lit on the main floor and the attic floor by three twin bays with semicircular arches and columns with capitals. The interior retains a joist ceiling whose joint strips are decorated with white saw teeth on a black background. The entire ceiling is black and is supported, to the south, by a floor plate on corbels. The interior splay of the north window retains traces of graffiti. The second floor originally consisted of a single room covered by a painted joist ceiling.

The decoration is based on the alternation, from one joist to the next, of a continuous row of quatrefoils with a discontinuous row of quatrefoils, themselves alternating with plant panels. Ash blue, mottled red, white and yellow are the dominant colors.

The ceiling itself is decorated with stylized stars alternating with shields originally bearing coats of arms but now completely faded. The background of the ceiling is reddish-brown while the decoration is white. This work could date from the 13th century."