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 Gravensteen is a castle in Ghent originating from the Middle Ages. The name means 'castle of the counts' in Dutch. Arnulf I (918–965), Count of Flanders, was the first to fortify this place, building a medieval bastion on this high sand dune, naturally protected by the river Leie and its marshy banks. This bastion consisted of a central wooden building and several surrounding buildings, also in wood.
In the early 11th century, the wooden building was replaced by a stone residence, consisting of three large halls that made up three storeys, connected by a stone stairwell. The monumental stone staircase, the light openings, the fireplaces built into the walls and the latrines were signs of considerable luxury and comfort in those days. There was probably also a tower.