Minat al-Qal'a ('harbour of the fort') is a medieval coastal fort protecting the port known as Ashdod. The fort was built by the Umayyads and later restored by the Crusaders.
The fort was built by the Umayyad Caliph Abd al-Malik ibn Marwan (reign 685–705 CE) before the end of the 7th century on top of Byzantine-era remains. It was in use during the 10th-11th centuries, and was restored and used again by the Crusaders in the late 12th century after sustaining serious damage from the 1033 earthquake. The fort was meant to protect the port from raids by the Byzantine navy, while the port itself was used by the same navy to exchange Muslim prisoners for ransom.
Archaeological excavations show that the fort was restored and reused during the Crusader period. They come to prove what was already known from documents from the era, which indicate that Nicolas de Beroard, a knight of lord Hugh of Ramla, was in charge of the stronghold in 1169. From this period it is known as Castellum Beroart.
The port stops being mentioned during the Ayyubid and Mamluk periods, making it likely that it was destroyed by the Muslims along with the other port cities from the coast of Palestine, due to fears that they might again be used by Crusader invasions from the sea.
The almost rectangular fortress (35x55 meters) was enclosed by a six to seven meters high curtain wall. It has four solid corner towers, and two semicircular ones flanking each of the two huge gates that gave access to the stronghold from the west and east.
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.