Windsor Castle is a medieval castle and royal residence in Windsor in the English county of Berkshire, notable for its long association with the British royal family and for its architecture. The original castle was built after the Norman invasion by William the Conqueror. Since the time of Henry I it has been used by a succession of monarchs and it is one of the oldest and largest occupied castle in the world and the Official Residence of Her Majesty The Queen.
Its rich history spans almost 1000 years. The Castle covers an area of about 5 hectares (13 acres). The castle remains an important ceremonial location. The Waterloo ceremony is carried out in the presence of the Queen each year, and the annual ceremony of the Order of the Garter takes place in St George's Chapel. Whilst the queen is in residence, the Guard Mounting ceremony occurs on a daily basis. The Royal Ascot procession leaves the castle each year during the annual meeting.