This plaque commemorates the old Quartier Isabelle of which the Rue Terarcken is a lucky survival. Charlotte and Emily Brontë would have passed this street when going to the Pensionnat Heger in the Rue d'Isabelle where they stayed in 1842-43. The memory of this area lives on in the vivid image Charlotte portrays in her novel Villette

A nice story at http://www.thebrusselsbrontegroup.org/secret%20mission.html