The Ridderzaal (Knights' Hall) is the main building at the Binnenhof in The Hague (Den Haag), which is used for the state opening of Parliament on the third Tuesday in September, "Prinsjesdag", when the Dutch monarch drives to Parliament in the Golden Carriage and delivers the speech from the throne. In the 13th century Floris IV, Count of Holland bought a piece of land next to a small lake to build a house on. The Ridderzaal, the manorial hall of Floris V, grandson of Floris IV, was built on this estate in the 13th century. Over the centuries, the government buildings developed around this lake and incorporated the Ridderzaal. From the early 17th century, the Ridderzaal became an important trading place for booksellers, as Westminster Hall was in London. In later centuries it served a variety of purposes - as a market hall, a promenade, a drill hall, a public record office, and a hospital ward. It was restored between 1898 and 1904 to serve its present purposes.
The Ridderzaal was also the venue for the Dutch-Indonesian Round Table Conference, in 1949.