The origins of this Benedictine abbey in Alet remain unknown: its foundation is attributed to Béra, the count of Razès, and his wife, Romille, in 813 A.D. but the documentary source of this information is not sure.
The history of the abbey has been one of a succession of quarrels and conflict due to its strategic location: for example, in the 11th century the abbey was ravaged by the Count of Carcassonne, then, in 1119, Alet abbey's rights over the abbey of Saint-Polycarpe were recognised to the detriment of the Lagrasse abbey.
The 12th century marked the peak of the abbey's history. It was very influential and attracted many pilgrims who came to see the abbey's relics of the Holy Cross.
The abbey was greatly weakened by the Crusade against the Cathars because of the ensuing conflicts with the Archbishop of Narbonne and the confiscation of property.
The Diocese of Alet was one of several bishoprics created in 1317 in the wake of the suppression of the Cathars. In Alet the bishops were also the abbots of the already existing monastery there and the cathedral of Our Lady was built next to the abbey.
In 1577 the cathedral was largely destroyed by the Huguenots during the Wars of Religion and was not subsequently rebuilt. The immense Gothic quire was demolished by order of the last bishop, Charles de la Cropte de Chancerac in 1776. The diocese of Alet was not restored after the French Revolution and by the Concordat of 1801 its parishes were added to the Diocese of Carcassonne.
The cathedral ruins remain a spectacular sight. As the main cathedral was for so long in ruins, part of the monastic buildings were used as an emergency substitute. These premises were known as St. Benedict's Cathedral.
References:Duino Castle was built by the Wallsee family in 1389 on the cliffs overlooking the Gulf of Trieste. It replaced an older castle from the 11th century. Over time, the Wallsee family disappeared and the castle, after having been used as a prison, became the residence of the Luogar and Hofer.
At the end of the 19th century it became the property of Prince Alexander von Thurn und Taxis from the Czech branch of the House of Thurn and Taxis. It remains with the family to this day with his great-grandson Prince Carlo Alessandro della Torre e Tasso, Duke of Castel Duino the current owner. The castle has been opened to the public as a museum and park.