The principal item of the bedroom is the bed. Four-poster beds exist since the 14th C., cast iron beds appeared in the 18th C. as did twin beds. The Imperial bed was in fashion during the Empire and Restauration periods.The early 19th C brought a new material, wrought iron. The Imperial bed was in fashion in France during the Empire and Restauration period. The sleigh bed was the most popular bed during the 19th C. Other bedroom furniture includes wardrobes, dressing tables and bedside tables. In the early 20th C matching suites of furniture appeared and it is now possible to have matching bedroom furniture in all styles such as Henri II, Gothic, Louis XV, Louis XVI, Rocaille, Art Nouveau to mention only a few.