However it has been an important military post and remarkable witness to the evolution of fortresses in the Pyrenean Piedmont, from the Middle Ages to our time.
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During the Gothic period (13C-15C) the castle was arranged in three successive lines of defence: the lower wall encircling the rock on which it is built, the castle with its bastioned upper wall and lastly the donjon.
At the time of Febus, the castle was commanded by Pierre Arnaud de Béarn, and then Jean, his brother, both cousins to the Prince of Béarn, with the help of 39 mercenaries (Compagnons de Lourdes), who signed in 1379, an agreement with the prince stipulating that any money and «prizes» in kind (wine, wheat) that might be received from the people of Bigorre had to be shared, in exchange of his «protection».
Later on, following the Wars of Religion (16C) and the 17C earthquakes, the castle was greatly restored: Vauban’s projects (1685), and modifications by the military Engineers (1828-1856) have given it its present appearance.