Windsor Castle is a royal residence at Windsor in the English county of Berkshire, about 25 miles (40 km) west of central London. It is strongly associated with the English and succeeding British royal family, and embodies almost a millennium of architectural history.
The original castle was built in the 11th century, after the Norman invasion of England by William the Conqueror. Since the time of Henry I (who reigned 1100–1135), it has been used by the monarch and is the longest-occupied palace in Europe. The castle's lavish early 19th-century state apartments were described by the art historian Hugh Roberts as "a superb and unrivalled sequence of rooms widely regarded as the finest and most complete expression of later Georgian taste".