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Origin and history

Mirabat Castle is a castle in ruins located in the Upper Salat, in Ariège, on the border of the municipalities of Seix, Oust and Ustou. Built in the 12th century, it was located at 1242 meters above sea level on a rocky piton, offering strategic views of the Pyrenean passes of Salau, Aula and Marterat. Its name, directed down, reflects its observation function, reinforced by a system of light or smoke signals to alert populations.

This medieval castle, dependent on the lords of Comminges, housed a garrison in the 12th and 13th centuries. It was coordinated with the Castle of the Guard to control invasions from the Pyrenean ridges. Available mainly since Seix, it was probably linked to the seigneury of the Taule, a hamlet whose name evokes an old toll on cross-border roads. Local lords, such as Roger de Balaguer and Odon de Taurignan, depended on the Barons of Aspet, allies of the Count of Comminges.

Abandoned from the 14th century because of its difficult access, the castle was mentioned in 1667 by Louis de Froidour, Grandmaster of the waters and forests of Louis XIV, who described his system of signals. Its remains, reduced to a enclosure without turrets, were built with stones extracted on site, including white marble. The ruins have been protected since 1995 as historical monuments.

Today, the site is only accessible on foot after a hike, offering remarkable views of the Pyrenees. Its defensive device, combined with that of the Castle of the Guard, is considered an architectural rarity for the medieval era. Local quarries and the use of white marble emphasize the adaptation of manufacturers to the available resources.

Mirabat Castle illustrates the strategic importance of the Pyrenean Passes in the Middle Ages, where the local lords had to monitor the passages while managing relations with the Viscounts of Couserans and the Counts of Comminges. Its early decline reflects the logistical challenges posed by its isolated location, despite its key role in regional defence.

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