Kew is a district in the London Borough of Richmond upon Thames. Its population at the 2011 census was 11,436. Kew is the location of the Royal Botanic Gardens, now a World Heritage Site, which includes Kew Palace. Kew is also the home of important historical documents such as Domesday Book, which is held at The National Archives. Julius Caesar may have forded the Thames at Kew in 54 BC during the Gallic Wars. Successive Tudor, Stuart and Georgian monarchs maintained links with Kew.