A town of Middlesex, built on an eminence 200 ft. high, 12 m. from St. Paul's, London; its church, St. Mary's, founded by Lanfranc, is a Gothic structure of great architectural interest. Harrow School, a celebrated public school, was founded in 1571 for the free education of 30 poor boys of the parish, but subsequently opened its doors to "foreigners," and now numbers upwards of 500 pupils.