Appenzell castle was built in 1563 as an elegant mansion the doctor Antoni Löw. Antoni was an enthusiastic supporter of the Protestant Reformation in Appenzell. In 1584 he was captured, judged and sentenced to death by the local Catholics for slandering a priest. After his death the castle was taken by the city and given to the Franciscans. They remained in the castle for almost a century, until 1682 when they moved into the newly completed St. Mary of the Angels. When the Franciscans moved out, the castle was sold to Antoni Speck who owned it until his death in 1708. It then passed to Johann Baptist Fortunat and then into the possession of the Sutter family.
On 15 February 1875 Doctor Anton Alfred Sutter became the sole owner of the castle. He established his practice in the castle, leading to it being known as the 'Doctor's House'. Today the castle remains the property of the Sutter family.
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.