The Třeboň chateau, southeast of the town centre, is an outstanding example of Renaissance architecture and is the town's foremost monument. It was once no more than a modest farmsted, later rebuilt into a fortress, and finally altered into a stone castle (first mentioned in 1374). At that time, Třeboň was purchased by the Rožmberks who, being both rich and generous, were interested in the further developmnet of the whole region. In the 15th century, the Hussites tried twice to besiege the fortified town, but fortunately did not succeed. In the 16th century, Třeboň became the most productive part of the Rožmberk dominion, however, the town, including the chateau, suffered terrible damage during the fire of 1562. Vilém of Rožmberk therefore appointed Jan and Antonio Ericers to reconstruct the old buildings into a Renaissance chateau. The reconstruction was finished by the famous architect Dominik Cometa. After the death of the last Rožmberk (1611), the Švamberks inhereted the chateau, however, they lost almost all of their possessions in the fatal battle at Bílá Hora (1620). Ferdinand II then presented his own family with the Třeboň estate, however, the property, so easily gained, was not looked after. Repairing of the chateau had to wait until it was purchased by the old German House of the Swarzenbergs in 1660, in whose possession it remained until 1940, when it was confiscated by the Gestapo during World War II. After the first land reform, in the early 1920s, when the Swarzenbergs left the chateau, it served as a hotel. In 1945, the state administration took over the maintainance of the chateau, becoming the owners in 1947.