There has been an ironworks in Jädersbruk since Middle Ages. It was originally owned by Julita Abbey. After Reformation Jädersbruk was confiscated to the Crown. King Gustav Vasa set up there the first arms manufactory “Arboga faktori, Jäders Bruk” to decrease the dependence of foreign weapons.
Weapons fere forged until the end of 17th century when the ironworks gradually started manufacturing of civilian products. The ironworks flourished until the early 20th century. Today the manor house and workers’ cottages remain and there are art and handicraft workshops.
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.