In 1870-72, John Marius Wilson's Imperial Gazetteer of England and Wales described Brent like this:
BRENT (The), a stream of Herts and Middlesex. It rises near Barnet; and runs 16 miles south-south-westward. past Handon and Hanwell, to the Thames at Brentford.
A Vision of Britain through Time includes a large library of local statistics for administrative units. For the best overall sense of how the area containing Brent has changed, please see our redistricted information for the modern district of Brent. More detailed statistical data are available under Units and statistics, which includes both administrative units covering Brent and units named after it.
GB Historical GIS / University of Portsmouth, History of Brent in Middlesex | Map and description, A Vision of Britain through Time.
Date accessed: 12th December 2013
Click here for more detailed advice on finding places within A Vision of Britain through Time, and maybe some references to other places called "Brent".