Kilburn is an area of north west London, England, which is divided between three London Boroughs, Brent, Camden, and a small part in Westminster. The main thoroughfare running northwest-southeast is Kilburn High Road, part of the modern A5 road which forms the boundary between the boroughs of Brent and Camden. The road dates back to pre-Roman times and is part of the Roman road known as Watling Street. The town of Kilburn has its origins in a 12th century priory on the banks of the Kilburn Brook. Kilburn today is a busy and multicultural London district. It has the highest Irish population of any London area, as well as a large Afro-Caribbean community. The area is identified in the London Plan as one of 35 major centres in Greater London.