Great Scotland Yard is a street in Westminster, London, connecting Northumberland Avenue and Whitehall. By the 16th century, this "yard", which was then a series of open courtyards within the Palace of Whitehall, was fronted by buildings used by diplomatic representatives of the Kingdom of Scotland. Over time the land was divided into Great Scotland Yard, Middle Scotland Yard and Little Scotland Yard. In the 19th century, it was a street and open space, which was the location of a public entrance to the original headquarters of the Metropolitan Police Service of London, causing the name "Scotland Yard" to become synonymous with the police service.