Escaladieu Abbey was a Cistercian abbey located in the French commune of Bonnemazon. Its name derives from the Latin Scala Dei ('ladder of God'). The abbey was founded in 1142 and became an important pilgrimage stop on the Way of St. James en route to the Cathedral of Santiago de Compostela. The abbey is situated at the confluence of the Luz and the Arros rivers near the Château de Mauvezin.
The abbey was continuously inhabited by Cistercian monks until 1830 when it sold to an unknown local family. In 1986, the abbey was purchased by the Conseil Général des Hautes-Pyrénées which undertook its restoration.
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.