The commandery of Saint-Jean-d'Acre is a monumental complex founded by the Hospitallers. From the first years of the establishment of the Crusaders in the city, the Hospitallers received donated properties. In 1110, King Baldwin granted the permission to them to keep the buildings located to the north of the Sainte-Croix church. In the years 1130, the buildings were damaged during works near the church and the Hospitallers decided to move near the 12th century north wall of the city. This is the actual place of the commandery.
In 1149, the first testimony of the commandery is in a document concerning the construction of the Saint-Jean church. In 1169, a pilgrim described the commandery of the Hospitallers of Acre as a very impressive fortified building.
After the defeat of Hattin in 1187, Saladin took the city. In 1191, during the third Crusade, the Frankish reconquer Acre after its siege. The Hospitallers moved back in their buildings. Jerusalem is no longer in the hands of the crusaders. And so the commandery becomes the new headquarters of the order. A new construction campaign took place between the end of 12th century and 13th century with new wings and additional floors.
The courtyard has an area of 1200 m2 and is surrounded by a series of arcades. On the east side, a staircase leads to the upper parts. A well with a depth of 4.5 m is located near the north side and two shallow pools are next to this well. On the south side a pool with a depth of 1.5 m and another well were built.
The north wing was built along the north wall. There are ten vaulted rooms ten meters high built during the Frankish era. The exterior wall is massive with a thickness of 3.5 m. Later to the west, two new rooms will complete this building. In the south wall, there are windows that overlook a narrow passage and the wall of the pillar room. The entrance of the building is in the south side wall.
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.