The town of Bulle initially developed around its church which was, in 9th century, an ecclesiastical center of importance. The construction of the castle began certainly under the episcopate from Boniface (1231-1239). After the annexation of Bulle by the town of Freiburg, the castle became, since 1537, residence of the bailiffs'. Since 1848, it is the seat of the Prefecture of the Gruyère and receives the Court, the state police and the prisons.
Forming a quadrilateral of 41 x 44 meters, it includes main buildings on three sides. Its construction was carried out according to plans' of the Savoyard Castles, with small towers in the 4 corners.
The keep, enormous and separated by a small court, 33 meters is high and broad of 2.16m at its base. Its entry of origin is located at 9.7m ground. Less imposing, the turns of the three other angles are little towers placed in overhang in top of the walls.
This historical fortress has escaped with the fire which destroyed the city in 1805.
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.