On the banks of the Old Lake (Öreg tó), which is very popular with water sport enthusiasts, stands the castle which was built in the second half of the 14th C and reinforced with four corner towers around 1400. In the 15th C it was owned by the Hungarian kings who often stayed here. Under King Matthias it was extended to form a border fort against the Turks, by whom it was conquered more than once. In 1727 Count Eszterházy acquired the ruins and commissioned Jakob Fellner with its reconstruction, but only the bridge was built. During its rebuilding in Neo-Gothic style in 1893 it was attempted to restore it to its supposed original appearance - a move which was extensively undone in 1980.     

http://www.planetware.com/hungary/tata-h-vz-tat.htm