The baroque estate of Castle Kohfidisch located close to the Austrian-Hungarian border in the south of the Austrian state of Burgenland is very impressive through its majestic appearance. It serves as an important witness for the turbulent historic events in this area. In this thesis the former castle of the Hungarian noble Erddy family is extensively documented and a preservation concept is being developed as a base for future rehabilitation projects and construction activity. Special attention is given to the remaining artifacts in the castle and the possibility of their preservation. A further focus is the understanding of the complete setting of the estate and the explanation of the historical context. Scarce sources, missing archives, and a derelict building were a special challenge, but therefore the work on this project appears to be even more rewarding.