Château de Trémazan was constructed on a rocky outcrop and had a square keep which, following a partial collapse during the winter of 1995, exposed the interior to reveal a habitable tower of four floors, each with one chamber.
The history of Trémazan is intimately linked to that of the du Chastel (or Châtel) family. It was they who built it and made it their principal residence for several centuries. The origins of this dynasty are still shrouded in mist, but with the passage of history, they became very prominent. So much so that Chastels ended up taking their place in the high Breton aristocracy and being counted among the four most important families of the Viscounty of Léon. However, by the end of the 16th century, the elder branch of the family died out for lack of a male heir.
The present castle goes back mainly to the 13th and 14th centuries. The castle would have been built on the ruins of a castellum already existing in the 6th century. According to legend, Tanneguy du Chastel, founder of the abbey at Saint-Mathieu, was born here. The building became a stone castle around the 10th century. In 1220, it was destroyed during the war against the Duke of Brittany, then rebuilt thirty years later by Bernard du Châtel. Sold as national property after the French Revolution, the castle was abandoned in the 18th century. Apart from the 12th century square keep, remains include towers and the outer enceinte dating from the 13th, 14th and 15th centuries.
Today, the non-profit association S.O.S Château de Trémazan attempts to preserve the castle and to increase the knowledge of its past. Thus, samples of the castle beams gave rise to a study of dendrochronology for better dating of the building.
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.