In the 12th and 13th centuries the castle had only 2 square towers; the round tower was only added in the 15th century.
It was the home of the celebrated family of counts who became the viscount of Béarn, then kings of Navarre and kings of France..
In 1002 the castle figured in the testament of Roger the first count of Carcassonne who bequeathed it to his eldest son Bernard. Bernard Roger is the first to use the title Comte de Foix. The castle was the count's maion residence until 1290.