Pernegg Abbey was founded as a Premonstratensian nunnery in 1153. It was founded by Ekbert and Ulrich, who also founded the Geras Abbey about 10 kilometres from Pernegg.
Pernegg became a community of canons in 1584. In 1700 it became an abbey but was dissolved in 1783 under the reforms of Emperor Joseph II. In the mid-19th century the premises were acquired by Geras Abbey. Since 1995 they have been used as a retreat and seminar centre for the monastery at Geras.
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.