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 Walls of Constantinople are a series of defensive stone walls that have surrounded and protected the city of Constantinople (today Istanbul) since its founding as the new capital of the Roman Empire by Constantine the Great. With numerous additions and modifications during their history, they were the last great fortification system of antiquity, and one of the most complex and elaborate systems ever built. They were also the largest and strongest fortification in both the ancient and medieval world.
Initially built by Constantine the Great, the walls surrounded the new city on all sides, protecting it against attack from both sea and land. As the city grew, the famous double line of the Theodosian Walls was built in the 5th century. Although the other sections of the walls were less elaborate, they were, when well-manned, almost impregnable for any medieval besieger.