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:The Clementinum is a historic complex of buildings in Prague. Until recently the complex hosted the National, University and Technical libraries, the City Library also being located nearby on Mariánské Náměstí. The Technical library and the Municipal library have moved to the Prague National Technical Library at Technická 6 since 2009. It is currently in use as the National Library of the Czech Republic.
Its history dates from the existence of a chapel dedicated to Saint Clement in the 11th century. A Dominican monastery was founded in the medieval period, which was transformed in 1556 to a Jesuit college. In 1622 the Jesuits transferred the library of Charles University to the Klementinum, and the college was merged with the University in 1654. The Jesuits remained until 1773, when the Klementinum was established as an observatory, library, and university by the Empress Maria Theresa of Austria.